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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 278 |
| 4 | 20464 |
| 5 | 2948824 |
| 6 | 735078968 |
| 7 | 291153023664 |
| 8 | 172201253334528 |
| 9 | 145044581320046592 |
| 10 | 167609226267379703808 |
| 11 | 257816558769660828601344 |
| 12 | 514890814087717253133447168 |
| 13 | 1307445058678686737908660752384 |
| 14 | 4146656933568759002389401276616704 |
[1,1,9,278,20464,2948824,735078968,291153023664, 172201253334528,145044581320046592, 167609226267379703808,257816558769660828601344, 514890814087717253133447168, 1307445058678686737908660752384, 4146656933568759002389401276616704] |