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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 35 |
| 3 | 877 |
| 4 | 46173 |
| 5 | 4108044 |
| 6 | 550917287 |
| 7 | 103674052788 |
| 8 | 26046619272535 |
| 9 | 8420151470990221 |
| 10 | 3404266960229749907 |
| 11 | 1682802564587905472500 |
| 12 | 998472258682783813839141 |
| 13 | 700281698972322460184258208 |
| 14 | 573086115189070229131370358179 |
| 15 | 541208343386984031504989621465925 |
[1,4,35,877,46173,4108044,550917287,103674052788, 26046619272535,8420151470990221, 3404266960229749907,1682802564587905472500, 998472258682783813839141, 700281698972322460184258208, 573086115189070229131370358179, 541208343386984031504989621465925] |