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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 53 |
| 4 | 878 |
| 5 | 19904 |
| 6 | 573984 |
| 7 | 20112770 |
| 8 | 829953368 |
| 9 | 39425517072 |
| 10 | 2119169565120 |
| 11 | 127163052628512 |
| 12 | 8426599011632592 |
| 13 | 611181716437826832 |
| 14 | 48159349246147915944 |
| 15 | 4096752391897622411880 |
| 16 | 374189567290578072309504 |
| 17 | 36525100459236757201316352 |
[0,1,5,53,878,19904,573984,20112770,829953368, 39425517072,2119169565120,127163052628512, 8426599011632592,611181716437826832, 48159349246147915944,4096752391897622411880, 374189567290578072309504, 36525100459236757201316352] |