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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 0 |
| 5 | 5 |
| 6 | 5 |
| 7 | 5 |
| 8 | 28 |
| 9 | 54 |
| 10 | 102 |
| 11 | 287 |
| 12 | 630 |
| 13 | 1409 |
| 14 | 3506 |
| 15 | 8420 |
| 16 | 20697 |
| 17 | 51821 |
| 18 | 130825 |
| 19 | 337997 |
| 20 | 872356 |
| 21 | 2260185 |
| 22 | 5945295 |
| 23 | 15659744 |
| 24 | 41266655 |
| 25 | 109421291 |
| 26 | 290699216 |
| 27 | 772587608 |
| 28 | 2058208309 |
| 29 | 5491874491 |
| 30 | 14665358128 |
| 31 | 39213733667 |
[0,0,5,5,5,28,54,102,287,630,1409,3506,8420,20697, 51821,130825,337997,872356,2260185,5945295, 15659744,41266655,109421291,290699216,772587608, 2058208309,5491874491,14665358128,39213733667] |