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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 32 |
| 5 | 105 |
| 6 | 429 |
| 7 | 1563 |
| 8 | 6673 |
| 9 | 25959 |
| 10 | 112651 |
| 11 | 457235 |
| 12 | 2015671 |
| 13 | 8422815 |
| 14 | 37516109 |
| 15 | 160145249 |
| 16 | 719358925 |
| 17 | 3120482258 |
| 18 | 14110389142 |
| 19 | 61984334190 |
| 20 | 281826273716 |
| 21 | 1250535422363 |
| 22 | 5711981682731 |
| 23 | 25554828817066 |
| 24 | 117181130626924 |
| 25 | 527847897054903 |
| 26 | 2428588448829353 |
| 27 | 11002765062169712 |
| 28 | 50771524681148388 |
[1,1,3,8,32,105,429,1563,6673,25959,112651,457235, 2015671,8422815,37516109,160145249,719358925, 3120482258,14110389142,61984334190,281826273716, 1250535422363,5711981682731,25554828817066, 117181130626924,527847897054903,2428588448829353, 11002765062169712,50771524681148388] |