The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 39 |
| 3 | 203 |
| 4 | 1031 |
| 5 | 5187 |
| 6 | 25999 |
| 7 | 130123 |
| 8 | 650871 |
| 9 | 3254867 |
| 10 | 16275359 |
| 11 | 81378843 |
| 12 | 406898311 |
| 13 | 2034499747 |
| 14 | 10172515119 |
| 15 | 50862608363 |
| 16 | 254313107351 |
| 17 | 1271565667827 |
| 18 | 6357828601279 |
| 19 | 31789143530683 |
[1,7,39,203,1031,5187,25999,130123,650871,3254867, 16275359,81378843,406898311,2034499747, 10172515119,50862608363,254313107351, 1271565667827,6357828601279,31789143530683] |