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| n | a(n) |
|---|---|
| 10 | 1 |
| 11 | 20 |
| 12 | 328 |
| 13 | 4770 |
| 14 | 66878 |
| 15 | 881044 |
| 16 | 11345200 |
| 17 | 143582500 |
| 18 | 1810580532 |
| 19 | 22845779214 |
| 20 | 289758406436 |
| 21 | 3699018969840 |
| 22 | 47578794728944 |
| 23 | 616911019060838 |
| 24 | 8069080071958188 |
| 25 | 106539250822676328 |
| 26 | 1420990036454689148 |
| 27 | 19157908196042318138 |
| 28 | 261230865243883014080 |
[1,20,328,4770,66878,881044,11345200,143582500, 1810580532,22845779214,289758406436,3699018969840, 47578794728944,616911019060838,8069080071958188, 106539250822676328,1420990036454689148, 19157908196042318138,261230865243883014080] |