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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 30 |
| 4 | 138 |
| 5 | 594 |
| 6 | 2839 |
| 7 | 12892 |
| 8 | 62672 |
| 9 | 292932 |
| 10 | 1436996 |
| 11 | 6835949 |
| 12 | 33718615 |
| 13 | 162274753 |
| 14 | 803263075 |
| 15 | 3897110532 |
| 16 | 19337079017 |
| 17 | 94365819222 |
| 18 | 469026208827 |
| 19 | 2298901953651 |
| 20 | 11440293086123 |
| 21 | 56262404021750 |
| 22 | 280242464558274 |
| 23 | 1381838922334531 |
| 24 | 6887750756939698 |
| 25 | 34033897373797286 |
| 26 | 169733701806981701 |
[1,2,8,30,138,594,2839,12892,62672,292932,1436996, 6835949,33718615,162274753,803263075,3897110532, 19337079017,94365819222,469026208827, 2298901953651,11440293086123,56262404021750, 280242464558274,1381838922334531,6887750756939698, 34033897373797286,169733701806981701] |