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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 10 |
| 3 | 39 |
| 4 | 210 |
| 5 | 960 |
| 6 | 5340 |
| 7 | 26250 |
| 8 | 148610 |
| 9 | 761796 |
| 10 | 4360356 |
| 11 | 22971102 |
| 12 | 132469260 |
| 13 | 711426144 |
| 14 | 4124979144 |
| 15 | 22471772895 |
| 16 | 130833575730 |
| 17 | 720642479700 |
| 18 | 4209268283220 |
| 19 | 23389011317958 |
| 20 | 136971640993044 |
| 21 | 766537623135648 |
| 22 | 4498668129173400 |
| 23 | 25325478605719656 |
| 24 | 148897823229533196 |
| 25 | 842422760884567800 |
[1,2,10,39,210,960,5340,26250,148610,761796, 4360356,22971102,132469260,711426144,4124979144, 22471772895,130833575730,720642479700, 4209268283220,23389011317958,136971640993044, 766537623135648,4498668129173400, 25325478605719656,148897823229533196, 842422760884567800] |