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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 90 |
| 4 | 1620 |
| 5 | 11810 |
| 6 | 56613 |
| 7 | 206234 |
| 8 | 623904 |
| 9 | 1641654 |
| 10 | 3882985 |
| 11 | 8431280 |
| 12 | 17078364 |
| 13 | 32641102 |
| 14 | 59401153 |
| 15 | 103638420 |
| 16 | 174341920 |
| 17 | 284041304 |
| 18 | 449881893 |
| 19 | 694849380 |
| 20 | 1049316180 |
| 21 | 1552766796 |
| 22 | 2255936441 |
| 23 | 3223157762 |
| 24 | 4535226864 |
| 25 | 6292505300 |
| 26 | 8618661337 |
| 27 | 11664674406 |
| 28 | 15613614884 |
[0,1,90,1620,11810,56613,206234,623904,1641654, 3882985,8431280,17078364,32641102,59401153, 103638420,174341920,284041304,449881893,694849380, 1049316180,1552766796,2255936441,3223157762, 4535226864,6292505300,8618661337,11664674406, 15613614884] |