The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 62 |
| 3 | 454 |
| 4 | 3348 |
| 5 | 24734 |
| 6 | 182760 |
| 7 | 1350428 |
| 8 | 9978382 |
| 9 | 73730824 |
| 10 | 544801200 |
| 11 | 4025566630 |
| 12 | 29745137662 |
| 13 | 219788490858 |
| 14 | 1624029488844 |
| 15 | 12000044999386 |
| 16 | 88669005690160 |
| 17 | 655180257281000 |
| 18 | 4841163675961122 |
| 19 | 35771629985782052 |
[8,62,454,3348,24734,182760,1350428,9978382, 73730824,544801200,4025566630,29745137662, 219788490858,1624029488844,12000044999386, 88669005690160,655180257281000,4841163675961122, 35771629985782052] |