The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 7 |
| 5 | 19 |
| 6 | 37 |
| 7 | 102 |
| 8 | 1264 |
| 9 | 9091 |
| 10 | 48176 |
| 11 | 418130 |
| 12 | 8182255 |
| 13 | 143523182 |
| 14 | 2278072430 |
| 15 | 53254810257 |
| 16 | 2027413206531 |
| 17 | 84728501324609 |
| 18 | 3776435859240528 |
| 19 | 226344677177142828 |
| 20 | 18987749209358606115 |
| 21 | 1902812184280545994272 |
[1,7,19,37,102,1264,9091,48176,418130,8182255, 143523182,2278072430,53254810257,2027413206531, 84728501324609,3776435859240528, 226344677177142828,18987749209358606115, 1902812184280545994272] |