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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 39 |
| 4 | 161 |
| 5 | 688 |
| 6 | 3030 |
| 7 | 13679 |
| 8 | 62583 |
| 9 | 289432 |
| 10 | 1352823 |
| 11 | 6371322 |
| 12 | 30171367 |
| 13 | 143636119 |
| 14 | 686989470 |
| 15 | 3297242248 |
| 16 | 15873914485 |
| 17 | 76644248698 |
| 18 | 370959805872 |
| 19 | 1799101070446 |
| 20 | 8742006194463 |
| 21 | 42551408510633 |
| 22 | 207421894977486 |
| 23 | 1012449506176614 |
| 24 | 4948029015857372 |
| 25 | 24208750550937740 |
| 26 | 118561279931909506 |
[1,3,10,39,161,688,3030,13679,62583,289432, 1352823,6371322,30171367,143636119,686989470, 3297242248,15873914485,76644248698,370959805872, 1799101070446,8742006194463,42551408510633, 207421894977486,1012449506176614,4948029015857372, 24208750550937740,118561279931909506] |