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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 30 |
| 4 | 273 |
| 5 | 3321 |
| 6 | 38545 |
| 7 | 413435 |
| 8 | 4179623 |
| 9 | 40717550 |
| 10 | 389610397 |
| 11 | 3704647927 |
| 12 | 35103992478 |
| 13 | 330893886987 |
| 14 | 3100780107689 |
| 15 | 28983549003377 |
| 16 | 272016949455533 |
[1,6,30,273,3321,38545,413435,4179623,40717550, 389610397,3704647927,35103992478,330893886987, 3100780107689,28983549003377,272016949455533] |