| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 64 |
| 3 | 110 |
| 4 | 339 |
| 5 | 1519 |
| 6 | 5120 |
| 7 | 19185 |
| 8 | 72289 |
| 9 | 268933 |
| 10 | 999260 |
| 11 | 3734414 |
| 12 | 13938869 |
| 13 | 52011659 |
| 14 | 194106983 |
| 15 | 724518526 |
| 16 | 2704073894 |
| 17 | 10092448889 |
| 18 | 37668514694 |
| 19 | 140591829599 |
| 20 | 524735645048 |
| 21 | 1958492581750 |
| 22 | 7309762480795 |
| 23 | 27282526699864 |
[16,64,110,339,1519,5120,19185,72289,268933, 999260,3734414,13938869,52011659,194106983, 724518526,2704073894,10092448889,37668514694, 140591829599,524735645048,1958492581750, 7309762480795,27282526699864] |