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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 5 |
| 4 | 41 |
| 5 | 439 |
| 6 | 5869 |
| 7 | 94275 |
| 8 | 1770705 |
| 9 | 38102255 |
| 10 | 924580181 |
| 11 | 24984120523 |
| 12 | 744154938361 |
| 13 | 24224671103463 |
| 14 | 855748556756157 |
| 15 | 32604902612628419 |
| 16 | 1332864500919743393 |
| 17 | 58192519232324179423 |
| 18 | 2702582455278623736997 |
| 19 | 133037424985668849756603 |
[1,0,1,5,41,439,5869,94275,1770705,38102255, 924580181,24984120523,744154938361,24224671103463, 855748556756157,32604902612628419, 1332864500919743393,58192519232324179423, 2702582455278623736997,133037424985668849756603] |