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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 26 |
| 5 | 865 |
| 6 | 39268 |
| 7 | 2375965 |
| 8 | 185974145 |
| 9 | 18337523130 |
| 10 | 2227232055239 |
| 11 | 327003956573263 |
| 12 | 57121908284696448 |
| 13 | 11712143532463633752 |
| 14 | 2786114854266411595229 |
| 15 | 761208643373263480081077 |
| 16 | 236761580851204534640426709 |
| 17 | 83183218467008383189955036015 |
[1,0,0,1,26,865,39268,2375965,185974145, 18337523130,2227232055239,327003956573263, 57121908284696448,11712143532463633752, 2786114854266411595229,761208643373263480081077, 236761580851204534640426709, 83183218467008383189955036015] |