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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 7 |
| 3 | 336 |
| 4 | 880 |
| 5 | 6032 |
| 6 | 15792 |
| 7 | 741895 |
| 8 | 34853280 |
| 9 | 91247072 |
| 10 | 625416736 |
| 11 | 1637362272 |
| 12 | 76921173511 |
| 13 | 3613657792752 |
| 14 | 9460678925136 |
| 15 | 64844458022832 |
| 16 | 169764995085840 |
| 17 | 7975341111241735 |
| 18 | 374671267233275712 |
| 19 | 980902112224710592 |
| 20 | 6723203096097857600 |
| 21 | 17601574218852716736 |
| 22 | 826899317018844410887 |
[0,7,336,880,6032,15792,741895,34853280,91247072, 625416736,1637362272,76921173511,3613657792752, 9460678925136,64844458022832,169764995085840, 7975341111241735,374671267233275712, 980902112224710592,6723203096097857600, 17601574218852716736,826899317018844410887] |