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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 8 |
| 5 | 46 |
| 6 | 232 |
| 7 | 1093 |
| 8 | 4944 |
| 9 | 21778 |
| 10 | 94184 |
| 11 | 401930 |
| 12 | 1698160 |
| 13 | 7119516 |
| 14 | 29666704 |
| 15 | 123012781 |
| 16 | 508019104 |
| 17 | 2091005866 |
| 18 | 8582372584 |
| 19 | 35141476126 |
| 20 | 143595498544 |
| 21 | 585720020356 |
| 22 | 2385430111024 |
| 23 | 9701814930466 |
| 24 | 39411044641888 |
| 25 | 159926316674356 |
| 26 | 648348726966672 |
| 27 | 2626193752638388 |
[1,8,46,232,1093,4944,21778,94184,401930,1698160, 7119516,29666704,123012781,508019104,2091005866, 8582372584,35141476126,143595498544,585720020356, 2385430111024,9701814930466,39411044641888, 159926316674356,648348726966672,2626193752638388] |