| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 18 |
| 4 | 77 |
| 5 | 173 |
| 6 | 1111 |
| 7 | 1593 |
| 8 | 8382 |
| 9 | 18906 |
| 10 | 50281 |
| 11 | 167053 |
| 12 | 0 |
| 13 | 1620621 |
| 14 | 6307938 |
| 15 | 15126258 |
| 16 | 50008881 |
| 17 | 149142458 |
| 18 | 846122222 |
| 19 | 2480116437 |
| 20 | 5513600773 |
| 21 | 14667896198 |
| 22 | 49786655918 |
| 23 | 246644446642 |
| 24 | 529670494286 |
| 25 | 2466444446642 |
[1,10,18,77,173,1111,1593,8382,18906,50281,167053, 0,1620621,6307938,15126258,50008881,149142458, 846122222,2480116437,5513600773,14667896198, 49786655918,246644446642,529670494286, 2466444446642] |