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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 35 |
| 4 | 160 |
| 5 | 720 |
| 6 | 3413 |
| 7 | 16220 |
| 8 | 78941 |
| 9 | 386168 |
| 10 | 1913966 |
| 11 | 9534469 |
| 12 | 47882879 |
| 13 | 241540800 |
| 14 | 1225176455 |
| 15 | 6237701908 |
| 16 | 31886453967 |
| 17 | 163506199839 |
| 18 | 841042932257 |
| 19 | 4337370857108 |
| 20 | 22424551961962 |
| 21 | 116189867455606 |
| 22 | 603271009373456 |
| 23 | 3138073094395283 |
| 24 | 16352089769050877 |
| 25 | 85344855526327286 |
| 26 | 446101304547583159 |
[1,2,9,35,160,720,3413,16220,78941,386168,1913966, 9534469,47882879,241540800,1225176455,6237701908, 31886453967,163506199839,841042932257, 4337370857108,22424551961962,116189867455606, 603271009373456,3138073094395283, 16352089769050877,85344855526327286, 446101304547583159] |