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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 14 |
| 4 | 79 |
| 5 | 516 |
| 6 | 3802 |
| 7 | 30668 |
| 8 | 268815 |
| 9 | 2522594 |
| 10 | 25201736 |
| 11 | 266014607 |
| 12 | 2953171684 |
| 13 | 34326755191 |
| 14 | 416313253084 |
| 15 | 5251970372080 |
| 16 | 68737673434847 |
| 17 | 931207966502919 |
| 18 | 13031639620371226 |
| 19 | 188051624603419973 |
| 20 | 2793741995189126920 |
| 21 | 42668132798523737471 |
| 22 | 669061042470049870917 |
[1,1,3,14,79,516,3802,30668,268815,2522594, 25201736,266014607,2953171684,34326755191, 416313253084,5251970372080,68737673434847, 931207966502919,13031639620371226, 188051624603419973,2793741995189126920, 42668132798523737471,669061042470049870917] |