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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 24 |
| 4 | 97 |
| 5 | 398 |
| 6 | 1709 |
| 7 | 7516 |
| 8 | 33623 |
| 9 | 152804 |
| 10 | 702023 |
| 11 | 3257118 |
| 12 | 15220657 |
| 13 | 71618594 |
| 14 | 338740110 |
| 15 | 1609684691 |
| 16 | 7680446968 |
| 17 | 36772243184 |
| 18 | 176594075393 |
| 19 | 850392064044 |
| 20 | 4104756720361 |
| 21 | 19855328329392 |
| 22 | 96229304321799 |
| 23 | 467172180895143 |
| 24 | 2271541047696563 |
| 25 | 11060726188373753 |
| 26 | 53926404954551133 |
| 27 | 263226318212262293 |
[1,2,7,24,97,398,1709,7516,33623,152804,702023, 3257118,15220657,71618594,338740110,1609684691, 7680446968,36772243184,176594075393,850392064044, 4104756720361,19855328329392,96229304321799, 467172180895143,2271541047696563, 11060726188373753,53926404954551133, 263226318212262293] |