| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 136 |
| 3 | 3464 |
| 4 | 117640 |
| 5 | 4993928 |
| 6 | 254396296 |
| 7 | 15119104904 |
| 8 | 1026912225160 |
| 9 | 78468091562888 |
| 10 | 6662087721342856 |
| 11 | 622186077361470344 |
| 12 | 63389713864392140680 |
| 13 | 6996476832548305415048 |
| 14 | 831619554631233264449416 |
| 15 | 105909083171031626820475784 |
[1,8,136,3464,117640,4993928,254396296, 15119104904,1026912225160,78468091562888, 6662087721342856,622186077361470344, 63389713864392140680,6996476832548305415048, 831619554631233264449416, 105909083171031626820475784] |