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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 884 |
| 4 | 37560 |
| 5 | 449234 |
| 6 | 4930949 |
| 7 | 45129433 |
| 8 | 390165523 |
| 9 | 3162500791 |
| 10 | 24713889390 |
| 11 | 186977339538 |
| 12 | 1381411316900 |
| 13 | 10004037615934 |
| 14 | 71283461550273 |
| 15 | 500987588246711 |
| 16 | 3480142902681961 |
| 17 | 23932311514960749 |
| 18 | 163138923128023302 |
[0,1,884,37560,449234,4930949,45129433,390165523, 3162500791,24713889390,186977339538,1381411316900, 10004037615934,71283461550273,500987588246711, 3480142902681961,23932311514960749, 163138923128023302] |