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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 0 |
| 4 | 9 |
| 5 | 25 |
| 6 | 70 |
| 7 | 406 |
| 8 | 2093 |
| 9 | 10935 |
| 10 | 41961 |
| 11 | 267751 |
| 12 | 1745040 |
| 13 | 9744384 |
| 14 | 60271016 |
| 15 | 369277000 |
| 16 | 2981920373 |
| 17 | 19297914599 |
| 18 | 136978951579 |
| 19 | 1039245386419 |
| 20 | 8924928983999 |
| 21 | 65392069094065 |
| 22 | 539711448752906 |
| 23 | 4489189106832134 |
| 24 | 39604974257078180 |
| 25 | 404561197077466250 |
[1,0,9,25,70,406,2093,10935,41961,267751,1745040, 9744384,60271016,369277000,2981920373,19297914599, 136978951579,1039245386419,8924928983999, 65392069094065,539711448752906,4489189106832134, 39604974257078180,404561197077466250] |