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| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 7 |
| 4 | 26 |
| 5 | 100 |
| 6 | 392 |
| 7 | 1552 |
| 8 | 6176 |
| 9 | 24640 |
| 10 | 98432 |
| 11 | 393472 |
| 12 | 1573376 |
| 13 | 6292480 |
| 14 | 25167872 |
| 15 | 100667392 |
| 16 | 402661376 |
| 17 | 1610629120 |
| 18 | 6442483712 |
| 19 | 25769869312 |
| 20 | 103079346176 |
| 21 | 412317122560 |
| 22 | 1649267965952 |
| 23 | 6597070815232 |
| 24 | 26388281163776 |
[2,7,26,100,392,1552,6176,24640,98432,393472, 1573376,6292480,25167872,100667392,402661376, 1610629120,6442483712,25769869312,103079346176, 412317122560,1649267965952,6597070815232, 26388281163776] |