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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 40 |
| 4 | 169 |
| 5 | 729 |
| 6 | 3249 |
| 7 | 14717 |
| 8 | 67436 |
| 9 | 312803 |
| 10 | 1461936 |
| 11 | 6878212 |
| 12 | 32557918 |
| 13 | 154799224 |
| 14 | 739043897 |
| 15 | 3540956927 |
| 16 | 17015609718 |
| 17 | 81988739469 |
| 18 | 395987808269 |
| 19 | 1916493786483 |
| 20 | 9292986559674 |
| 21 | 45136611500778 |
| 22 | 219563958375717 |
| 23 | 1069533315247073 |
| 24 | 5216387240816365 |
| 25 | 25470886932498859 |
| 26 | 124501742320960825 |
[1,3,10,40,169,729,3249,14717,67436,312803, 1461936,6878212,32557918,154799224,739043897, 3540956927,17015609718,81988739469,395987808269, 1916493786483,9292986559674,45136611500778, 219563958375717,1069533315247073,5216387240816365, 25470886932498859,124501742320960825] |