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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 24 |
| 4 | 103 |
| 5 | 422 |
| 6 | 1897 |
| 7 | 8252 |
| 8 | 38343 |
| 9 | 173194 |
| 10 | 817272 |
| 11 | 3772830 |
| 12 | 18000984 |
| 13 | 84356373 |
| 14 | 405594146 |
| 15 | 1921360373 |
| 16 | 9287840494 |
| 17 | 44344952313 |
| 18 | 215279896503 |
| 19 | 1034203427064 |
| 20 | 5037048253756 |
| 21 | 24314646830982 |
| 22 | 118735070137360 |
| 23 | 575379742866056 |
| 24 | 2815825128273828 |
| 25 | 13688879652455073 |
| 26 | 67110918573106876 |
[1,2,7,24,103,422,1897,8252,38343,173194,817272, 3772830,18000984,84356373,405594146,1921360373, 9287840494,44344952313,215279896503,1034203427064, 5037048253756,24314646830982,118735070137360, 575379742866056,2815825128273828, 13688879652455073,67110918573106876] |