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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 13 |
| 3 | 330 |
| 4 | 12411 |
| 5 | 618870 |
| 6 | 38461522 |
| 7 | 2863440580 |
| 8 | 248440887123 |
| 9 | 24616763946918 |
| 10 | 2742625188929990 |
| 11 | 339386813915985836 |
| 12 | 46184075261030623710 |
| 13 | 6854605372617955658940 |
| 14 | 1101943692701420653738500 |
| 15 | 190748265085183804327197000 |
| 16 | 35373318817392757170821576835 |
[1,1,13,330,12411,618870,38461522,2863440580, 248440887123,24616763946918,2742625188929990, 339386813915985836,46184075261030623710, 6854605372617955658940,1101943692701420653738500, 190748265085183804327197000, 35373318817392757170821576835] |