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| n | a(n) |
|---|---|
| 10 | 0 |
| 11 | 0 |
| 12 | 0 |
| 13 | 0 |
| 14 | 0 |
| 15 | 5 |
| 16 | 17 |
| 17 | 38 |
| 18 | 86 |
| 19 | 365 |
| 20 | 1575 |
| 21 | 11904 |
| 22 | 249324 |
| 23 | 14103554 |
| 24 | 5358891212 |
| 25 | 19563802362362 |
| 26 | 3359230167951559162 |
| 27 | 181335944930584275675837231 |
| 28 | 54416647690014492928933662292768862601 |
| 29 | 6605721238793689879501639879905020611382966457124102349 |
| 30 | 360539645288616164606228883801608423987740093330992456820074646988075733781888309 |
[0,0,0,0,0,5,17,38,86,365,1575,11904,249324, 14103554,5358891212,19563802362362, 3359230167951559162,181335944930584275675837231, 54416647690014492928933662292768862601, 66057212387936898795016398799050206113829664571241\ 02349, 36053964528861616460622888380160842398774009333099\ 2456820074646988075733781888309] |