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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 29 |
| 4 | 126 |
| 5 | 537 |
| 6 | 2425 |
| 7 | 10961 |
| 8 | 50711 |
| 9 | 235665 |
| 10 | 1107734 |
| 11 | 5232216 |
| 12 | 24871809 |
| 13 | 118726407 |
| 14 | 569049504 |
| 15 | 2736451496 |
| 16 | 13196496626 |
| 17 | 63803454991 |
| 18 | 309138528256 |
| 19 | 1500831550268 |
| 20 | 7298596720638 |
| 21 | 35549469936136 |
| 22 | 173388821932599 |
| 23 | 846758809565578 |
| 24 | 4139917910331022 |
| 25 | 20261613086661582 |
| 26 | 99259150135499873 |
[1,2,8,29,126,537,2425,10961,50711,235665,1107734, 5232216,24871809,118726407,569049504,2736451496, 13196496626,63803454991,309138528256, 1500831550268,7298596720638,35549469936136, 173388821932599,846758809565578,4139917910331022, 20261613086661582,99259150135499873] |