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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 47 |
| 5 | 246 |
| 6 | 1602 |
| 7 | 11481 |
| 8 | 95503 |
| 9 | 871030 |
| 10 | 5250758 |
| 11 | 38454351 |
| 12 | 273492122 |
| 13 | 2051148347 |
| 14 | 15736849481 |
| 15 | 125536061475 |
| 16 | 1041102777023 |
| 17 | 8537848507142 |
| 18 | 74739775725270 |
| 19 | 569218702884915 |
| 20 | 4674633861692302 |
| 21 | 37899687815748825 |
| 22 | 312237339834676391 |
| 23 | 2586068757754063445 |
[1,1,3,10,47,246,1602,11481,95503,871030,5250758, 38454351,273492122,2051148347,15736849481, 125536061475,1041102777023,8537848507142, 74739775725270,569218702884915,4674633861692302, 37899687815748825,312237339834676391, 2586068757754063445] |