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| n | a(n) |
|---|---|
| 1 | 12 |
| 2 | 284 |
| 3 | 5436 |
| 4 | 96768 |
| 5 | 1664184 |
| 6 | 28069444 |
| 7 | 467722524 |
| 8 | 7730252080 |
| 9 | 127023181352 |
| 10 | 2078332922360 |
| 11 | 33894711502744 |
| 12 | 551368536346176 |
| 13 | 8950922822411504 |
| 14 | 145068948446193428 |
| 15 | 2347940754318431196 |
| 16 | 37957946888159573968 |
| 17 | 613052225104703442120 |
| 18 | 9893099103451554441736 |
[12,284,5436,96768,1664184,28069444,467722524, 7730252080,127023181352,2078332922360, 33894711502744,551368536346176,8950922822411504, 145068948446193428,2347940754318431196, 37957946888159573968,613052225104703442120, 9893099103451554441736] |