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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 12 |
| 3 | 57 |
| 4 | 471 |
| 5 | 6159 |
| 6 | 105987 |
| 7 | 2207847 |
| 8 | 53715891 |
| 9 | 1493742279 |
| 10 | 46730999667 |
| 11 | 1624397276487 |
| 12 | 62111517207411 |
| 13 | 2590839950614599 |
| 14 | 117076879593900147 |
| 15 | 5697526788322329927 |
| 16 | 297074131510779228531 |
| 17 | 16522357697381918530119 |
| 18 | 976355872514689231565427 |
[1,3,12,57,471,6159,105987,2207847,53715891, 1493742279,46730999667,1624397276487, 62111517207411,2590839950614599, 117076879593900147,5697526788322329927, 297074131510779228531,16522357697381918530119, 976355872514689231565427] |