The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 26 |
| 2 | 676 |
| 3 | 2812 |
| 4 | 12040 |
| 5 | 55752 |
| 6 | 264568 |
| 7 | 1296732 |
| 8 | 6454684 |
| 9 | 32683022 |
| 10 | 167198926 |
| 11 | 864092006 |
| 12 | 4497241498 |
| 13 | 23558938146 |
| 14 | 124023147194 |
| 15 | 655770988392 |
| 16 | 3479572547812 |
| 17 | 18519847945360 |
| 18 | 98824043025544 |
| 19 | 528523700450064 |
[26,676,2812,12040,55752,264568,1296732,6454684, 32683022,167198926,864092006,4497241498, 23558938146,124023147194,655770988392, 3479572547812,18519847945360,98824043025544, 528523700450064] |