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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 36 |
| 4 | 379 |
| 5 | 5461 |
| 6 | 100476 |
| 7 | 2250613 |
| 8 | 59432141 |
| 9 | 1807959042 |
| 10 | 62262816157 |
| 11 | 2394551966401 |
| 12 | 101724440338494 |
| 13 | 4730814590128615 |
| 14 | 239057921691911861 |
| 15 | 13042779411190737420 |
| 16 | 764136645388807739239 |
| 17 | 47846833035272035228849 |
| 18 | 3188740106752561252031364 |
[0,1,5,36,379,5461,100476,2250613,59432141, 1807959042,62262816157,2394551966401, 101724440338494,4730814590128615, 239057921691911861,13042779411190737420, 764136645388807739239,47846833035272035228849, 3188740106752561252031364] |