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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 9 |
| 4 | 44 |
| 5 | 123 |
| 6 | 986 |
| 7 | 5043 |
| 8 | 45832 |
| 9 | 366300 |
| 10 | 3862429 |
| 11 | 39916803 |
| 12 | 495023832 |
| 13 | 6227020803 |
| 14 | 88549595295 |
| 15 | 1308012377572 |
| 16 | 21086922542349 |
| 17 | 355687428096003 |
| 18 | 6427700493998229 |
| 19 | 121645100408832003 |
[1,1,5,9,44,123,986,5043,45832,366300,3862429, 39916803,495023832,6227020803,88549595295, 1308012377572,21086922542349,355687428096003, 6427700493998229,121645100408832003] |