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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 247 |
| 4 | 94877 |
| 5 | 30356977796 |
| 6 | 2483366140159363703668 |
| 7 | 6499666232105156317865843115636308117901695 |
| 8 | 22811803675498431414266490631921174975482932628189677045602787109048977013209434652111 |
[1,4,247,94877,30356977796,2483366140159363703668, 6499666232105156317865843115636308117901695, 22811803675498431414266490631921174975482932628189\ 677045602787109048977013209434652111] |