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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 59 |
| 3 | 498 |
| 4 | 1577 |
| 5 | 8702 |
| 6 | 42613 |
| 7 | 210362 |
| 8 | 1459669 |
| 9 | 7676361 |
| 10 | 44631710 |
| 11 | 307975889 |
| 12 | 1766468801 |
| 13 | 10941194118 |
| 14 | 74842408447 |
| 15 | 452000693891 |
| 16 | 2882180117494 |
| 17 | 19523455903949 |
| 18 | 121423010910314 |
| 19 | 784247000876085 |
| 20 | 5259836130609437 |
[4,59,498,1577,8702,42613,210362,1459669,7676361, 44631710,307975889,1766468801,10941194118, 74842408447,452000693891,2882180117494, 19523455903949,121423010910314,784247000876085, 5259836130609437] |