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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 248 |
| 3 | 3975 |
| 4 | 29104 |
| 5 | 119405 |
| 6 | 436818 |
| 7 | 1105537 |
| 8 | 2790818 |
| 9 | 5902335 |
| 10 | 12074356 |
[1,248,3975,29104,119405,436818,1105537,2790818, 5902335,12074356] |