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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 228 |
| 3 | 3248 |
| 4 | 56868 |
| 5 | 846384 |
| 6 | 14395920 |
| 7 | 218556096 |
| 8 | 3662534436 |
| 9 | 56236646576 |
| 10 | 933921124752 |
| 11 | 14445103689408 |
| 12 | 238434118702864 |
| 13 | 3706773418885824 |
| 14 | 60917716297733184 |
| 15 | 950622015752780544 |
| 16 | 15571249887287040804 |
| 17 | 243694280206569964464 |
| 18 | 3981466564018425521424 |
[1,12,228,3248,56868,846384,14395920,218556096, 3662534436,56236646576,933921124752, 14445103689408,238434118702864,3706773418885824, 60917716297733184,950622015752780544, 15571249887287040804,243694280206569964464, 3981466564018425521424] |