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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 45 |
| 4 | 187 |
| 5 | 821 |
| 6 | 3655 |
| 7 | 16563 |
| 8 | 76299 |
| 9 | 353565 |
| 10 | 1656135 |
| 11 | 7795435 |
| 12 | 36891565 |
| 13 | 175420449 |
| 14 | 836797617 |
| 15 | 4006135089 |
| 16 | 19230908851 |
| 17 | 92540054469 |
| 18 | 446356079927 |
| 19 | 2156844527511 |
| 20 | 10441603416177 |
| 21 | 50626840016573 |
| 22 | 245823100672597 |
| 23 | 1195188859800625 |
| 24 | 5817880545154171 |
| 25 | 28351170944975535 |
| 26 | 138298991887389517 |
[1,3,11,45,187,821,3655,16563,76299,353565, 1656135,7795435,36891565,175420449,836797617, 4006135089,19230908851,92540054469,446356079927, 2156844527511,10441603416177,50626840016573, 245823100672597,1195188859800625,5817880545154171, 28351170944975535,138298991887389517] |