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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 40 |
| 3 | 385 |
| 4 | 4345 |
| 5 | 57876 |
| 6 | 926340 |
| 7 | 18088835 |
| 8 | 434349525 |
| 9 | 12879458545 |
| 10 | 473368667181 |
| 11 | 21628231535280 |
| 12 | 1231043822730950 |
| 13 | 87448787189791250 |
| 14 | 7764880712865963895 |
| 15 | 862911010853538242176 |
| 16 | 120154448960730327164325 |
[1,5,40,385,4345,57876,926340,18088835,434349525, 12879458545,473368667181,21628231535280, 1231043822730950,87448787189791250, 7764880712865963895,862911010853538242176, 120154448960730327164325] |