The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 7 |
| 7 | 19 |
| 8 | 37 |
| 9 | 76 |
| 10 | 382 |
| 11 | 2724 |
| 12 | 16177 |
| 13 | 82034 |
| 14 | 576215 |
| 15 | 5993574 |
| 16 | 76883371 |
| 17 | 996696560 |
| 18 | 14175824222 |
| 19 | 255455613029 |
[1,7,19,37,76,382,2724,16177,82034,576215,5993574, 76883371,996696560,14175824222,255455613029] |