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| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 434 |
| 3 | 2336 |
| 4 | 12624 |
| 5 | 68064 |
| 6 | 366568 |
| 7 | 1976940 |
| 8 | 10657560 |
| 9 | 57441532 |
| 10 | 309578264 |
| 11 | 1668794652 |
| 12 | 8995139000 |
| 13 | 48484851148 |
| 14 | 261335232440 |
| 15 | 1408647749404 |
| 16 | 7592807398296 |
| 17 | 40926289471308 |
| 18 | 220597727495896 |
| 19 | 1189054017281884 |
[81,434,2336,12624,68064,366568,1976940,10657560, 57441532,309578264,1668794652,8995139000, 48484851148,261335232440,1408647749404, 7592807398296,40926289471308,220597727495896, 1189054017281884] |