The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 7 |
| 6 | 19 |
| 7 | 37 |
| 8 | 61 |
| 9 | 398 |
| 10 | 3352 |
| 11 | 18677 |
| 12 | 76887 |
| 13 | 524948 |
| 14 | 7212413 |
| 15 | 105020342 |
| 16 | 1220235443 |
| 17 | 15236713872 |
| 18 | 301443806483 |
| 19 | 8288724969974 |
| 20 | 237668565804989 |
| 21 | 6783028496183063 |
[1,7,19,37,61,398,3352,18677,76887,524948,7212413, 105020342,1220235443,15236713872,301443806483, 8288724969974,237668565804989,6783028496183063] |