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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 9 |
| 2 | 46 |
| 3 | 264 |
| 4 | 1602 |
| 5 | 9981 |
| 6 | 63068 |
| 7 | 402058 |
| 8 | 2579386 |
| 9 | 16629321 |
| 10 | 107637426 |
| 11 | 699032274 |
| 12 | 4552606344 |
| 13 | 29722287276 |
| 14 | 194458646688 |
[1,9,46,264,1602,9981,63068,402058,2579386, 16629321,107637426,699032274,4552606344, 29722287276,194458646688] |