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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 45 |
| 3 | 1432 |
| 4 | 101725 |
| 5 | 12938076 |
| 6 | 2559100705 |
| 7 | 721024536688 |
| 8 | 272966047708329 |
| 9 | 133221961930843000 |
| 10 | 81267877305115964881 |
| 11 | 60493579458078813579864 |
| 12 | 53901953276076347752558885 |
| 13 | 56594161930292786377035193022 |
| 14 | 69104546575462679469462451015875 |
| 15 | 97044923170365199810426927635301216 |
[1,4,45,1432,101725,12938076,2559100705, 721024536688,272966047708329,133221961930843000, 81267877305115964881,60493579458078813579864, 53901953276076347752558885, 56594161930292786377035193022, 69104546575462679469462451015875, 97044923170365199810426927635301216] |