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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 12 |
| 4 | 16 |
| 5 | 214 |
| 6 | 324 |
| 7 | 2960 |
| 8 | 6442 |
| 9 | 42656 |
| 10 | 113575 |
| 11 | 636361 |
| 12 | 1918550 |
| 13 | 9612512 |
| 14 | 31689325 |
| 15 | 147107038 |
| 16 | 515046002 |
| 17 | 2273096344 |
| 18 | 8287463026 |
| 19 | 35352586169 |
| 20 | 132498950637 |
| 21 | 552353463562 |
| 22 | 2109344649645 |
| 23 | 8657596384451 |
| 24 | 33484770583688 |
[1,1,12,16,214,324,2960,6442,42656,113575,636361, 1918550,9612512,31689325,147107038,515046002, 2273096344,8287463026,35352586169,132498950637, 552353463562,2109344649645,8657596384451, 33484770583688] |