The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 255 |
| 2 | 1101 |
| 3 | 5034 |
| 4 | 25451 |
| 5 | 132095 |
| 6 | 723774 |
| 7 | 3983941 |
| 8 | 22797711 |
| 9 | 129296092 |
| 10 | 756671245 |
| 11 | 4355865411 |
| 12 | 25775863718 |
| 13 | 149461131883 |
| 14 | 889200135475 |
| 15 | 5174050599728 |
| 16 | 30862163101623 |
| 17 | 179882294574133 |
| 18 | 1074306258732204 |
| 19 | 6266781494242621 |
[255,1101,5034,25451,132095,723774,3983941, 22797711,129296092,756671245,4355865411, 25775863718,149461131883,889200135475, 5174050599728,30862163101623,179882294574133, 1074306258732204,6266781494242621] |