The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 53 |
| 3 | 373 |
| 4 | 2617 |
| 5 | 18329 |
| 6 | 128311 |
| 7 | 898181 |
| 8 | 6287273 |
| 9 | 44010929 |
| 10 | 308076523 |
| 11 | 2156535743 |
| 12 | 15095750209 |
| 13 | 105670251529 |
| 14 | 739691760707 |
| 15 | 5177842324987 |
| 16 | 36244896274921 |
| 17 | 253714273924549 |
| 18 | 1775999917471859 |
| 19 | 12431999422303051 |
[7,53,373,2617,18329,128311,898181,6287273, 44010929,308076523,2156535743,15095750209, 105670251529,739691760707,5177842324987, 36244896274921,253714273924549,1775999917471859, 12431999422303051] |