A020474 - OEIS

A020474 as a triangular array

1

0 1

0 1 2

0 0 2 4

0 0 1 5 9

0 0 0 3 12 21

0 0 0 1 9 30 51

0 0 0 0 4 25 76 127

0 0 0 0 1 14 69 196 323

0 0 0 0 0 5 44 189 512 835

0 0 0 0 0 1 20 133 518 1353 2188

0 0 0 0 0 0 6 70 392 1422 3610 5798

0 0 0 0

1 0 0 0 0 0 0 0 0 0 0 0 0

1 1 0 0 0 0 0 0 0 0 0 0

2 2 1 0 0 0 0 0 0 0 0

4 5 3 1 0 0 0 0 0 0

9 12 9 4 1 0 0 0

21 30 25 14 5 1 0

51 76 69 44 20 6

127 196 189 133 70

323 512 518 392

835 1353 1422

2188 3610

5798