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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 37 |
| 3 | 299 |
| 4 | 2517 |
| 5 | 21700 |
| 6 | 190051 |
| 7 | 1683218 |
| 8 | 15033173 |
| 9 | 135142796 |
| 10 | 1221246132 |
| 11 | 11083374659 |
| 12 | 100946732307 |
| 13 | 922205369324 |
| 14 | 8446802334994 |
| 15 | 77542088287444 |
| 16 | 713250450657109 |
| 17 | 6572130378649468 |
| 18 | 60652194138406780 |
| 19 | 560522209086365852 |
[1,5,37,299,2517,21700,190051,1683218,15033173, 135142796,1221246132,11083374659,100946732307, 922205369324,8446802334994,77542088287444, 713250450657109,6572130378649468, 60652194138406780,560522209086365852] |