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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1242 |
| 3 | 11916 |
| 4 | 72252 |
| 5 | 266544 |
| 6 | 807090 |
| 7 | 2006856 |
| 8 | 4603284 |
| 9 | 8924940 |
| 10 | 17571816 |
| 11 | 30168396 |
| 12 | 51799212 |
| 13 | 82147608 |
| 14 | 132245676 |
| 15 | 191541024 |
| 16 | 294596676 |
| 17 | 410924988 |
| 18 | 590219898 |
| 19 | 800792568 |
| 20 | 1123700904 |
| 21 | 1442103768 |
| 22 | 1991926080 |
| 23 | 2519984088 |
| 24 | 3314316426 |
| 25 | 4155999192 |
| 26 | 5427108108 |
[1,0,1242,11916,72252,266544,807090,2006856, 4603284,8924940,17571816,30168396,51799212, 82147608,132245676,191541024,294596676,410924988, 590219898,800792568,1123700904,1442103768, 1991926080,2519984088,3314316426,4155999192, 5427108108] |