The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 512 |
| 2 | 2744 |
| 3 | 13824 |
| 4 | 68921 |
| 5 | 314432 |
| 6 | 1367631 |
| 7 | 5832000 |
| 8 | 24137569 |
| 9 | 97336000 |
| 10 | 385828352 |
| 11 | 1505060136 |
| 12 | 5783534875 |
| 13 | 21952000000 |
| 14 | 82426462208 |
| 15 | 306454670488 |
| 16 | 1129412837944 |
| 17 | 4129885013184 |
| 18 | 14994306423179 |
| 19 | 54087346107432 |
[512,2744,13824,68921,314432,1367631,5832000, 24137569,97336000,385828352,1505060136,5783534875, 21952000000,82426462208,306454670488, 1129412837944,4129885013184,14994306423179, 54087346107432] |