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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 94 |
| 3 | 280 |
| 4 | 1718 |
| 5 | 11368 |
| 6 | 66728 |
| 7 | 417156 |
| 8 | 2714271 |
| 9 | 17610616 |
| 10 | 114357451 |
| 11 | 754664057 |
| 12 | 4990029946 |
| 13 | 33020899414 |
| 14 | 219676934231 |
| 15 | 1462873913126 |
| 16 | 9748125500261 |
| 17 | 65076163909949 |
| 18 | 434605951697906 |
| 19 | 2903524017998302 |
| 20 | 19410022768455530 |
[16,94,280,1718,11368,66728,417156,2714271, 17610616,114357451,754664057,4990029946, 33020899414,219676934231,1462873913126, 9748125500261,65076163909949,434605951697906, 2903524017998302,19410022768455530] |