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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 24 |
| 3 | 438 |
| 4 | 16072 |
| 5 | 851866 |
| 6 | 65286276 |
| 7 | 6769229670 |
| 8 | 908362886512 |
| 9 | 153172480730482 |
| 10 | 31664861861245692 |
| 11 | 7869073015313071518 |
| 12 | 2313193245685672638952 |
| 13 | 793542325131834122104042 |
[1,4,24,438,16072,851866,65286276,6769229670, 908362886512,153172480730482,31664861861245692, 7869073015313071518,2313193245685672638952, 793542325131834122104042] |