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| n | a(n) |
|---|---|
| 1 | 12 |
| 2 | 28 |
| 3 | 192 |
| 4 | 964 |
| 5 | 5416 |
| 6 | 31280 |
| 7 | 173792 |
| 8 | 977092 |
| 9 | 5562216 |
| 10 | 31839976 |
| 11 | 182830560 |
| 12 | 1054020072 |
| 13 | 6094150672 |
| 14 | 35317631800 |
| 15 | 205154575120 |
| 16 | 1194077810020 |
| 17 | 6961965310984 |
| 18 | 40654382303400 |
| 19 | 237732203953600 |
| 20 | 1391919066252408 |
[12,28,192,964,5416,31280,173792,977092,5562216, 31839976,182830560,1054020072,6094150672, 35317631800,205154575120,1194077810020, 6961965310984,40654382303400,237732203953600, 1391919066252408] |