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| n | a(n) |
|---|---|
| 1 | 2688 |
| 2 | 12152 |
| 3 | 47232 |
| 4 | 267792 |
| 5 | 1194976 |
| 6 | 8198512 |
| 7 | 39075520 |
| 8 | 304813760 |
| 9 | 1473291680 |
| 10 | 12478506368 |
| 11 | 59636481088 |
| 12 | 535236270096 |
| 13 | 2503920262432 |
| 14 | 23537439554576 |
| 15 | 107432965882112 |
| 16 | 1051469946423328 |
| 17 | 4680802226580960 |
| 18 | 47517003414905184 |
[2688,12152,47232,267792,1194976,8198512,39075520, 304813760,1473291680,12478506368,59636481088, 535236270096,2503920262432,23537439554576, 107432965882112,1051469946423328,4680802226580960, 47517003414905184] |