| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 4 |
| 5 | 13 |
| 6 | 38 |
| 7 | 98 |
| 8 | 531 |
| 9 | 1912 |
| 10 | 8138 |
| 11 | 31418 |
| 12 | 126393 |
| 13 | 495376 |
| 14 | 1962086 |
| 15 | 7714610 |
| 16 | 30417808 |
| 17 | 119689616 |
| 18 | 471372482 |
| 19 | 1855574610 |
| 20 | 7307585933 |
| 21 | 28780361988 |
| 22 | 113386055388 |
| 23 | 446810002208 |
| 24 | 1761249761801 |
| 25 | 6944518447036 |
| 26 | 27390257810022 |
[1,4,13,38,98,531,1912,8138,31418,126393,495376, 1962086,7714610,30417808,119689616,471372482, 1855574610,7307585933,28780361988,113386055388, 446810002208,1761249761801,6944518447036, 27390257810022] |