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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 21 |
| 4 | 95 |
| 5 | 324 |
| 6 | 1277 |
| 7 | 4673 |
| 8 | 17768 |
| 9 | 66245 |
| 10 | 249499 |
| 11 | 934816 |
| 12 | 3511945 |
| 13 | 13175625 |
| 14 | 49465544 |
| 15 | 185641901 |
| 16 | 696836263 |
| 17 | 2615432756 |
| 18 | 9816980965 |
| 19 | 36846924297 |
| 20 | 138302568456 |
| 21 | 519106314333 |
| 22 | 1948425878179 |
| 23 | 7313254531824 |
| 24 | 27449718110385 |
[1,8,21,95,324,1277,4673,17768,66245,249499, 934816,3511945,13175625,49465544,185641901, 696836263,2615432756,9816980965,36846924297, 138302568456,519106314333,1948425878179, 7313254531824,27449718110385] |