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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 34 |
| 4 | 283 |
| 5 | 2729 |
| 6 | 29544 |
| 7 | 352104 |
| 8 | 4559687 |
| 9 | 63573407 |
| 10 | 947909441 |
| 11 | 15037580982 |
| 12 | 252782021044 |
| 13 | 4487786298844 |
| 14 | 83912052363380 |
| 15 | 1648445429802720 |
| 16 | 33951169908341967 |
| 17 | 731690301608252315 |
| 18 | 16471202941397846823 |
| 19 | 386668709172261717342 |
| 20 | 9451628348167374521091 |
[1,1,5,34,283,2729,29544,352104,4559687,63573407, 947909441,15037580982,252782021044,4487786298844, 83912052363380,1648445429802720,33951169908341967, 731690301608252315,16471202941397846823, 386668709172261717342,9451628348167374521091] |