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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 73 |
| 4 | 2488 |
| 5 | 123535 |
| 6 | 8144527 |
| 7 | 675856090 |
| 8 | 68118924622 |
| 9 | 8127605321929 |
| 10 | 1125932450595736 |
| 11 | 178367047220336887 |
| 12 | 31919374476052799215 |
| 13 | 6387927327635465158768 |
| 14 | 1417660111210685715869386 |
| 15 | 346403593023300571689592957 |
| 16 | 92622566428288426844609245312 |
[1,1,4,73,2488,123535,8144527,675856090, 68118924622,8127605321929,1125932450595736, 178367047220336887,31919374476052799215, 6387927327635465158768,1417660111210685715869386, 346403593023300571689592957, 92622566428288426844609245312] |