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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 | 1530 |
| 21 | 11770 |
| 22 | 249015 |
| 23 | 14102902 |
| 24 | 5358889889 |
| 25 | 19563802359728 |
| 26 | 3359230167951553969 |
| 27 | 181335944930584275675827047 |
| 28 | 54416647690014492928933662292768842690 |
| 29 | 6605721238793689879501639879905020611382966457124063495 |
| 30 | 360539645288616164606228883801608423987740093330992456820074646988075733781755269 |
[0,0,0,0,0,5,17,38,86,365,1530,11770,249015, 14102902,5358889889,19563802359728, 3359230167951553969,181335944930584275675827047, 54416647690014492928933662292768842690, 66057212387936898795016398799050206113829664571240\ 63495, 36053964528861616460622888380160842398774009333099\ 2456820074646988075733781755269] |