n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 4 |
4 | 26 |
5 | 236 |
6 | 2760 |
7 | 39572 |
8 | 672592 |
9 | 13227804 |
10 | 295579520 |
11 | 7398318500 |
12 | 205075286784 |
13 | 6236796259916 |
14 | 206489747516416 |
15 | 7393749269685300 |
16 | 284714599444490240 |
17 | 11733037015160276348 |
18 | 515240326393584058368 |
19 | 24019843795708471562564 |
20 | 1184776250223810469888000 |
[0,1,4,26,236,2760,39572,672592,13227804, 295579520,7398318500,205075286784,6236796259916, 206489747516416,7393749269685300, 284714599444490240,11733037015160276348, 515240326393584058368,24019843795708471562564, 1184776250223810469888000] |