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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 8 |
| 4 | 32 |
| 5 | 84 |
| 6 | 346 |
| 7 | 1035 |
| 8 | 4434 |
| 9 | 14276 |
| 10 | 63150 |
| 11 | 213816 |
| 12 | 965176 |
| 13 | 3397665 |
| 14 | 15525463 |
| 15 | 56362226 |
| 16 | 259816633 |
| 17 | 966364827 |
| 18 | 4488211510 |
| 19 | 17021512470 |
| 20 | 79566536014 |
| 21 | 306669648097 |
| 22 | 1441164065549 |
| 23 | 5631486475726 |
| 24 | 26580640449773 |
| 25 | 105101670791449 |
| 26 | 497927703722680 |
| 27 | 1989118558545756 |
| 28 | 9454227000026822 |
[1,1,4,8,32,84,346,1035,4434,14276,63150,213816, 965176,3397665,15525463,56362226,259816633, 966364827,4488211510,17021512470,79566536014, 306669648097,1441164065549,5631486475726, 26580640449773,105101670791449,497927703722680, 1989118558545756,9454227000026822] |