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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 11 |
| 6 | 159 |
| 7 | 2488 |
| 8 | 43169 |
| 9 | 822113 |
| 10 | 17066007 |
| 11 | 384422661 |
| 12 | 9357185385 |
| 13 | 245099146171 |
| 14 | 6881055868664 |
| 15 | 206270437643247 |
| 16 | 6578921849694561 |
| 17 | 222533460191360229 |
| 18 | 7959059236941486231 |
| 19 | 300168498172776752829 |
| 20 | 11907361524870216908385 |
| 21 | 495692886834636282431752 |
[1,0,0,0,1,11,159,2488,43169,822113,17066007, 384422661,9357185385,245099146171,6881055868664, 206270437643247,6578921849694561, 222533460191360229,7959059236941486231, 300168498172776752829,11907361524870216908385, 495692886834636282431752] |