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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 24 |
| 4 | 94 |
| 5 | 378 |
| 6 | 1544 |
| 7 | 6380 |
| 8 | 26598 |
| 9 | 111658 |
| 10 | 471358 |
| 11 | 1998924 |
| 12 | 8509368 |
| 13 | 36341278 |
| 14 | 155634228 |
| 15 | 668116136 |
| 16 | 2874157222 |
| 17 | 12387209982 |
| 18 | 53475080494 |
| 19 | 231189987224 |
| 20 | 1000834283190 |
| 21 | 4337864724462 |
| 22 | 18821884379924 |
| 23 | 81748960355484 |
| 24 | 355383570351664 |
| 25 | 1546239230878154 |
[1,2,6,24,94,378,1544,6380,26598,111658,471358, 1998924,8509368,36341278,155634228,668116136, 2874157222,12387209982,53475080494,231189987224, 1000834283190,4337864724462,18821884379924, 81748960355484,355383570351664,1546239230878154] |