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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 18 |
| 2 | 171 |
| 3 | 1139 |
| 4 | 5967 |
| 5 | 26163 |
| 6 | 99806 |
| 7 | 340101 |
| 8 | 1055070 |
| 9 | 3022463 |
| 10 | 8084196 |
| 11 | 20366271 |
| 12 | 48670438 |
| 13 | 110977461 |
| 14 | 242626770 |
| 15 | 510702236 |
| 16 | 1038606993 |
| 17 | 2046949686 |
| 18 | 3919950135 |
| 19 | 7310939625 |
| 20 | 13306606299 |
| 21 | 23677953958 |
| 22 | 41257164222 |
| 23 | 70494485616 |
[1,18,171,1139,5967,26163,99806,340101,1055070, 3022463,8084196,20366271,48670438,110977461, 242626770,510702236,1038606993,2046949686, 3919950135,7310939625,13306606299,23677953958, 41257164222,70494485616] |