Some Canonical Sequences of Integers M. Bernstein(*) and N. J. A. Sloane(**) Mathematical Sciences Research Center AT&T Bell Laboratories Murray Hill, NJ 07974 USA (*)Present address: Mathematics Department Univ. California Berkeley 887 Evans Hall Berkeley CA 94720-3840 Email: mira@math.berkeley.edu (**)Present address: Information Sciences Research AT&T Shannon Lab Florham Park, NJ 07932-0971 USA Email: njas@research.att.com Dedicated to Professor J. J. Seidel Abstract Extending earlier work of R. Donaghey and P. J. Cameron, we investigate some canonical "eigen-sequences" associated with transformations of integer sequences. Several known sequences appear in a new setting: for instance the sequences (such as 1, 3, 11, 49, 257, 1531, ...) studied by T. Tsuzuku, H. O. Foulkes and A. Kerber in connection with multiply transitive groups are eigen-sequences for the binomial transform. Many interesting new sequences also arise, such as 1, 1, 2, 26, 152, 1144, ..., which shifts one place left when transformed by the Stirling numbers of the second kind, and whose exponential generating function satisfies A'(x) = A(e^x -1) + 1. For the full version see http://www.research.att.com/~njas/doc/eigen.pdf (pdf) or http://www.research.att.com/~njas/doc/eigen.ps (ps) This paper was published (in a somewhat different form) in Linear Algebra and Its Applications, Vol. 226/228 (The Seidel Festschrift) (1995), pp. 57-72. [Math. Rev. 96i:05004]. Erratum: Linear Algebra Appl. 320 (2000), no. 1-3, 210.