The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 12 |
| 2 | 144 |
| 3 | 1103 |
| 4 | 7878 |
| 5 | 51800 |
| 6 | 330951 |
| 7 | 2070564 |
| 8 | 12830802 |
| 9 | 79045687 |
| 10 | 485544940 |
| 11 | 2977554668 |
| 12 | 18243896709 |
| 13 | 111730524932 |
| 14 | 684100356564 |
| 15 | 4188038973519 |
| 16 | 25637266851722 |
| 17 | 156933921465968 |
| 18 | 960624347689059 |
| 19 | 5880116589637756 |
[12,144,1103,7878,51800,330951,2070564,12830802, 79045687,485544940,2977554668,18243896709, 111730524932,684100356564,4188038973519, 25637266851722,156933921465968,960624347689059, 5880116589637756] |