The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 31 |
| 2 | 961 |
| 3 | 2040 |
| 4 | 20104 |
| 5 | 157472 |
| 6 | 759482 |
| 7 | 6513576 |
| 8 | 49975640 |
| 9 | 259077468 |
| 10 | 2150453548 |
| 11 | 15981869071 |
| 12 | 87310201135 |
| 13 | 709311394273 |
| 14 | 5137197417469 |
| 15 | 29284543214864 |
| 16 | 233502033554208 |
| 17 | 1657717100658198 |
| 18 | 9791967204391982 |
| 19 | 76739391151731042 |
[31,961,2040,20104,157472,759482,6513576,49975640, 259077468,2150453548,15981869071,87310201135, 709311394273,5137197417469,29284543214864, 233502033554208,1657717100658198,9791967204391982, 76739391151731042] |