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| n | a(n) |
|---|---|
| 1 | 432 |
| 2 | 2956 |
| 3 | 20236 |
| 4 | 138534 |
| 5 | 948412 |
| 6 | 6493036 |
| 7 | 44452660 |
| 8 | 304332258 |
| 9 | 2083523194 |
| 10 | 14264241960 |
| 11 | 97656029050 |
| 12 | 668573914642 |
| 13 | 4577199017242 |
| 14 | 31336476646048 |
| 15 | 214536174915418 |
| 16 | 1468760220688680 |
| 17 | 10055444434320028 |
| 18 | 68841708367472026 |
[432,2956,20236,138534,948412,6493036,44452660, 304332258,2083523194,14264241960,97656029050, 668573914642,4577199017242,31336476646048, 214536174915418,1468760220688680, 10055444434320028,68841708367472026] |