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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 18 |
| 3 | 386 |
| 4 | 15150 |
| 5 | 946082 |
| 6 | 86148762 |
| 7 | 10776331778 |
| 8 | 1773210244230 |
| 9 | 371367615732002 |
| 10 | 96462262816769586 |
| 11 | 30433572793375652738 |
| 12 | 11463680237091180885150 |
| 13 | 5081782052880868302982562 |
| 14 | 2618864991559576227420716490 |
| 15 | 1552537179057766207300655437826 |
[1,2,18,386,15150,946082,86148762,10776331778, 1773210244230,371367615732002,96462262816769586, 30433572793375652738,11463680237091180885150, 5081782052880868302982562, 2618864991559576227420716490, 1552537179057766207300655437826] |