a(n,m) tabl head (triangle) for A104471 n\m 1 2 3 4 5 6 7 8 9 10 ... 1 1 0 0 0 0 0 0 0 0 0 2 2 1 0 0 0 0 0 0 0 0 3 3 4 1 0 0 0 0 0 0 0 4 4 5 4 1 0 0 0 0 0 0 5 5 8 8 4 1 0 0 0 0 0 6 6 9 11 8 4 1 0 0 0 0 7 7 12 12 15 8 4 1 0 0 0 8 8 13 18 16 15 8 4 1 0 0 9 9 16 19 22 21 15 8 4 1 0 10 10 17 22 23 27 21 15 8 4 1 . . . The rectangular array ay(N,m):=a(n+m-1,m) is: m\N 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 ... 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 2 1 4 5 8 9 12 13 16 17 20 21 24 25 28 29 32 33 36 37 40 3 1 4 8 11 12 18 19 22 26 29 30 36 37 40 44 47 48 54 55 58 4 1 4 8 15 16 22 23 30 34 37 38 48 49 52 56 63 64 70 71 78 5 1 4 8 15 21 27 28 35 39 47 48 58 59 62 71 78 79 85 86 98 6 1 4 8 15 21 33 34 41 45 53 54 70 71 74 83 90 91 103 104 116 7 1 4 8 15 21 33 41 48 52 60 61 77 78 88 97 104 105 117 118 130 8 1 4 8 15 21 33 41 56 60 68 69 85 86 96 105 120 121 133 134 146 9 1 4 8 15 21 33 41 56 69 77 78 94 95 105 114 129 130 151 152 164 10 1 4 8 15 21 33 41 56 69 87 88 104 105 115 124 139 140 161 162 184 . . . The sequence for N=m is the sequence A024916(N): [1, 4, 8, 15, 21, 33, 41, 56, 69, 87, 99, 127, 141, 165, 189, 220, 238, 277, 297, 339,...] and the entries for N>m are the same as for N=m, namely A024916(N). The triangle with the repeated numbers omitted is given in A104472.