That constant appears in "On Number and Games" by J.H.Conway.

it also refers to this entry in the Encyclopedia of Integer Sequences
(On - Line Version).


A047995
A047995 "On Numbers and Games" incorrectly states that the next term is 2^4171780 - 2^2095104 - 3*2^2094593 - 2^209
4081 - 3*2^2091522 - 2^2088960 - 3*2^2088448 - 2^2087937 - 2^2086912 - 2^2086657 - 2^2086401 - 2^2086145 - 2^208588
8 - 2^2079234 + 2^1960962
A047995 0,2
A047995 1,2,3,5,22,4171780
A047995 Cf. A037142.
A047995 J. H. Conway, On Numbers and Games, pp. 139-140.
A047995 Next term = 2^4171780 - 2^2096640 - 2^2095104 - 2^2094593 - 2^2094080 - 3.2^2091522 - 2^2088960 - 2^2088705 - 2^2088448 - 2^2088193 - 2^2086912 - 2^2086657 - 2^2086401 - 2^2086145 - 2^2085888 - 2^2079234 + 2^1960962 + 21 (
Chris Thompson, cet1@cam.a
A047995 Number of impartial misere games born on or before day n.
A047995 huge,nice,nonn
A047995 njas



See also a more complete account into the context in 

http://pauillac.inria.fr/algo/bsolve/itrexp/er.html

at the Favorite Mathematical Constants site of Steve Finch.