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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 23 |
| 4 | 94 |
| 5 | 372 |
| 6 | 1601 |
| 7 | 6859 |
| 8 | 30453 |
| 9 | 135845 |
| 10 | 616764 |
| 11 | 2817542 |
| 12 | 12999781 |
| 13 | 60321173 |
| 14 | 281686783 |
| 15 | 1321486207 |
| 16 | 6227878448 |
| 17 | 29458162344 |
| 18 | 139817921161 |
| 19 | 665585392406 |
| 20 | 3176982885480 |
| 21 | 15200786463565 |
| 22 | 72890162063702 |
| 23 | 350208999904052 |
| 24 | 1685662658510866 |
| 25 | 8127023245849525 |
| 26 | 39241967006575773 |
| 27 | 189747828370462283 |
[1,2,7,23,94,372,1601,6859,30453,135845,616764, 2817542,12999781,60321173,281686783,1321486207, 6227878448,29458162344,139817921161,665585392406, 3176982885480,15200786463565,72890162063702, 350208999904052,1685662658510866,8127023245849525, 39241967006575773,189747828370462283] |