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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 27 |
| 3 | 151 |
| 4 | 861 |
| 5 | 4969 |
| 6 | 28911 |
| 7 | 169187 |
| 8 | 994329 |
| 9 | 5862925 |
| 10 | 34658691 |
| 11 | 205305423 |
| 12 | 1218183669 |
| 13 | 7238062641 |
| 14 | 43055682327 |
| 15 | 256365292443 |
| 16 | 1527728176305 |
| 17 | 9110460044821 |
| 18 | 54362600841963 |
| 19 | 324557242893191 |
| 20 | 1938584147698701 |
[1,5,27,151,861,4969,28911,169187,994329,5862925, 34658691,205305423,1218183669,7238062641, 43055682327,256365292443,1527728176305, 9110460044821,54362600841963,324557242893191, 1938584147698701] |