n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 12 |
5 | 72 |
6 | 467 |
7 | 2900 |
8 | 18426 |
9 | 117323 |
10 | 756237 |
11 | 4910525 |
12 | 32135651 |
13 | 211604221 |
14 | 1401106330 |
15 | 9321239836 |
16 | 62271754986 |
17 | 417545272654 |
[0,0,1,12,72,467,2900,18426,117323,756237,4910525, 32135651,211604221,1401106330,9321239836, 62271754986,417545272654] |