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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 13 |
| 3 | 190 |
| 4 | 2925 |
| 5 | 46376 |
| 6 | 749398 |
| 7 | 12271518 |
| 8 | 202927725 |
| 9 | 3381098545 |
| 10 | 56672074888 |
| 11 | 954526728530 |
| 12 | 16141841823510 |
| 13 | 273897571557780 |
| 14 | 4660989191504198 |
| 15 | 79515468511191440 |
| 16 | 1359472297966470765 |
| 17 | 23287391568864135063 |
| 18 | 399584727647019644125 |
| 19 | 6866816177157320098000 |
[1,1,13,190,2925,46376,749398,12271518,202927725, 3381098545,56672074888,954526728530, 16141841823510,273897571557780,4660989191504198, 79515468511191440,1359472297966470765, 23287391568864135063,399584727647019644125, 6866816177157320098000] |