The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 12 |
| 3 | 151 |
| 4 | 1896 |
| 5 | 23809 |
| 6 | 298980 |
| 7 | 3754423 |
| 8 | 47145936 |
| 9 | 592032193 |
| 10 | 7434407868 |
| 11 | 93357119767 |
| 12 | 1172326292280 |
| 13 | 14721415345729 |
| 14 | 184863268194708 |
| 15 | 2321409125756599 |
| 16 | 29150952386442144 |
| 17 | 366061292517601921 |
| 18 | 4596792176916318060 |
| 19 | 57723935170619030167 |
[0,1,12,151,1896,23809,298980,3754423,47145936, 592032193,7434407868,93357119767,1172326292280, 14721415345729,184863268194708,2321409125756599, 29150952386442144,366061292517601921, 4596792176916318060,57723935170619030167] |