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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 14 |
| 5 | 65 |
| 6 | 251 |
| 7 | 1288 |
| 8 | 4830 |
| 9 | 25518 |
| 10 | 95388 |
| 11 | 510532 |
| 12 | 1910821 |
| 13 | 10309234 |
| 14 | 38656462 |
| 15 | 209766714 |
| 16 | 787912030 |
| 17 | 4294635438 |
| 18 | 16155375825 |
| 19 | 88371236851 |
| 20 | 332859949946 |
| 21 | 1826080683788 |
| 22 | 6885797551334 |
| 23 | 37867515477338 |
| 24 | 142929375411104 |
| 25 | 787637258527505 |
| 26 | 2975423924172735 |
| 27 | 16425495119248041 |
| 28 | 62096233990615140 |
| 29 | 343318987947145114 |
[1,3,14,65,251,1288,4830,25518,95388,510532, 1910821,10309234,38656462,209766714,787912030, 4294635438,16155375825,88371236851,332859949946, 1826080683788,6885797551334,37867515477338, 142929375411104,787637258527505,2975423924172735, 16425495119248041,62096233990615140, 343318987947145114] |