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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 134 |
| 3 | 1992 |
| 4 | 27650 |
| 5 | 343431 |
| 6 | 3777963 |
| 7 | 38762619 |
| 8 | 377102980 |
| 9 | 3519017214 |
| 10 | 31782863567 |
| 11 | 279755669078 |
| 12 | 2411988669554 |
| 13 | 20450270031430 |
| 14 | 171047927517261 |
| 15 | 1414934370045463 |
| 16 | 11599885089631470 |
| 17 | 94407727875281839 |
| 18 | 763843712572305864 |
[4,134,1992,27650,343431,3777963,38762619, 377102980,3519017214,31782863567,279755669078, 2411988669554,20450270031430,171047927517261, 1414934370045463,11599885089631470, 94407727875281839,763843712572305864] |