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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 15 |
| 4 | 194 |
| 5 | 1974 |
| 6 | 9856 |
| 7 | 34475 |
| 8 | 95466 |
| 9 | 224589 |
| 10 | 468854 |
| 11 | 893646 |
| 12 | 1585850 |
| 13 | 2656976 |
| 14 | 4246284 |
| 15 | 6523909 |
| 16 | 9693986 |
| 17 | 13997775 |
| 18 | 19716786 |
| 19 | 27175904 |
| 20 | 36746514 |
| 21 | 48849626 |
| 22 | 63959000 |
| 23 | 82604271 |
| 24 | 105374074 |
| 25 | 132919169 |
[0,0,15,194,1974,9856,34475,95466,224589,468854, 893646,1585850,2656976,4246284,6523909,9693986, 13997775,19716786,27175904,36746514,48849626, 63959000,82604271,105374074,132919169] |