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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 148 |
| 3 | 5360 |
| 4 | 336064 |
| 5 | 33016928 |
| 6 | 4702592128 |
| 7 | 916109321792 |
| 8 | 233761769443840 |
| 9 | 75609530052114272 |
| 10 | 30217485296206537600 |
| 11 | 14619289226216359893440 |
| 12 | 8419479060347378516614144 |
| 13 | 5691602671616456905273163456 |
[1,8,148,5360,336064,33016928,4702592128, 916109321792,233761769443840,75609530052114272, 30217485296206537600,14619289226216359893440, 8419479060347378516614144, 5691602671616456905273163456] |