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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 10 |
| 4 | 65 |
| 5 | 508 |
| 6 | 4534 |
| 7 | 44836 |
| 8 | 482214 |
| 9 | 5571102 |
| 10 | 68535590 |
| 11 | 891948664 |
| 12 | 12219277950 |
| 13 | 175517643148 |
| 14 | 2634970753976 |
| 15 | 41234024880680 |
| 16 | 671089318045929 |
| 17 | 11337092753702892 |
| 18 | 198460520744276042 |
| 19 | 3594448260682257548 |
| 20 | 67262821868324122100 |
| 21 | 1298836247390063831188 |
| 22 | 25850316392778428778716 |
[1,2,10,65,508,4534,44836,482214,5571102,68535590, 891948664,12219277950,175517643148,2634970753976, 41234024880680,671089318045929,11337092753702892, 198460520744276042,3594448260682257548, 67262821868324122100,1298836247390063831188, 25850316392778428778716] |