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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 34 |
| 4 | 150 |
| 5 | 682 |
| 6 | 3174 |
| 7 | 14970 |
| 8 | 71340 |
| 9 | 342710 |
| 10 | 1656644 |
| 11 | 8046426 |
| 12 | 39237846 |
| 13 | 191962322 |
| 14 | 941663210 |
| 15 | 4629658186 |
| 16 | 22805288372 |
| 17 | 112519961104 |
| 18 | 555947186900 |
| 19 | 2750201653992 |
| 20 | 13619337222924 |
| 21 | 67507071559382 |
| 22 | 334885832641942 |
| 23 | 1662481553291334 |
| 24 | 8258372677711584 |
| 25 | 41046761708327586 |
| 26 | 204119269616094816 |
[1,2,8,34,150,682,3174,14970,71340,342710,1656644, 8046426,39237846,191962322,941663210,4629658186, 22805288372,112519961104,555947186900, 2750201653992,13619337222924,67507071559382, 334885832641942,1662481553291334,8258372677711584, 41046761708327586,204119269616094816] |