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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 12 |
| 4 | 146 |
| 5 | 2820 |
| 6 | 79682 |
| 7 | 3109932 |
| 8 | 163268786 |
| 9 | 11373086100 |
| 10 | 1049057429762 |
| 11 | 128748967088412 |
| 12 | 21220651011079346 |
| 13 | 4747770003765805380 |
| 14 | 1456585782002699624642 |
| 15 | 6390825031791150383749864 |
[1,1,2,12,146,2820,79682,3109932,163268786, 11373086100,1049057429762,128748967088412, 21220651011079346,4747770003765805380, 1456585782002699624642,6390825031791150383749864] |