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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 37 |
| 4 | 415 |
| 5 | 6051 |
| 6 | 109476 |
| 7 | 2348767 |
| 8 | 58191451 |
| 9 | 1631827927 |
| 10 | 51029454163 |
| 11 | 1758883278967 |
| 12 | 66200568699170 |
| 13 | 2699977173047181 |
| 14 | 118561410689195358 |
| 15 | 5574984887552288475 |
| 16 | 279398986674750754195 |
| 17 | 14863338415349068099348 |
| 18 | 836304620387823727353480 |
[0,1,5,37,415,6051,109476,2348767,58191451, 1631827927,51029454163,1758883278967, 66200568699170,2699977173047181, 118561410689195358,5574984887552288475, 279398986674750754195,14863338415349068099348, 836304620387823727353480] |