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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 264 |
| 3 | 1144 |
| 4 | 4525 |
| 5 | 20686 |
| 6 | 104932 |
| 7 | 529381 |
| 8 | 2593409 |
| 9 | 12723622 |
| 10 | 63324996 |
| 11 | 317094174 |
| 12 | 1585110143 |
| 13 | 7916042111 |
| 14 | 39591620182 |
| 15 | 198355232579 |
| 16 | 994432912057 |
| 17 | 4986588408216 |
| 18 | 25014245719741 |
| 19 | 125539045973986 |
| 20 | 630285367123705 |
[16,264,1144,4525,20686,104932,529381,2593409, 12723622,63324996,317094174,1585110143,7916042111, 39591620182,198355232579,994432912057, 4986588408216,25014245719741,125539045973986, 630285367123705] |