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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 14 |
| 5 | 422 |
| 6 | 59433 |
| 7 | 43181280 |
| 8 | 178025660042 |
| 9 | 4550598470020490 |
| 10 | 782250333882971717562 |
| 11 | 974196106965358319940100513 |
| 12 | 9412280190038329162111356578977100 |
| 13 | 751537739224674099813783040471383322758327 |
[1,1,1,2,14,422,59433,43181280,178025660042, 4550598470020490,782250333882971717562, 974196106965358319940100513, 9412280190038329162111356578977100, 751537739224674099813783040471383322758327] |