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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 32 |
| 4 | 140 |
| 5 | 624 |
| 6 | 2835 |
| 7 | 13067 |
| 8 | 60938 |
| 9 | 286498 |
| 10 | 1356904 |
| 11 | 6459691 |
| 12 | 30892611 |
| 13 | 148291664 |
| 14 | 714120564 |
| 15 | 3448426056 |
| 16 | 16692404388 |
| 17 | 80968662585 |
| 18 | 393478911192 |
| 19 | 1915279956230 |
| 20 | 9336406678901 |
| 21 | 45571836417430 |
| 22 | 222704732448507 |
| 23 | 1089503921232924 |
| 24 | 5335248476500528 |
| 25 | 26149843216648124 |
| 26 | 128274792913583856 |
[1,2,8,32,140,624,2835,13067,60938,286498,1356904, 6459691,30892611,148291664,714120564,3448426056, 16692404388,80968662585,393478911192, 1915279956230,9336406678901,45571836417430, 222704732448507,1089503921232924,5335248476500528, 26149843216648124,128274792913583856] |