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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 8 |
| 5 | 59 |
| 6 | 244 |
| 7 | 791 |
| 8 | 2617 |
| 9 | 11259 |
| 10 | 81430 |
| 11 | 174119 |
| 12 | 255549 |
| 13 | 429668 |
| 14 | 685217 |
| 15 | 36060952 |
| 16 | 36746169 |
| 17 | 72807121 |
| 18 | 109553290 |
| 19 | 291913701 |
| 20 | 2152949197 |
| 21 | 8903710489 |
| 22 | 28864080664 |
| 23 | 95495952481 |
| 24 | 410847890588 |
| 25 | 2971431186597 |
| 26 | 6353710263782 |
| 27 | 9325141450379 |
| 28 | 15678851714161 |
[1,1,2,3,8,59,244,791,2617,11259,81430,174119, 255549,429668,685217,36060952,36746169,72807121, 109553290,291913701,2152949197,8903710489, 28864080664,95495952481,410847890588, 2971431186597,6353710263782,9325141450379, 15678851714161] |