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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 19 |
| 4 | 73 |
| 5 | 297 |
| 6 | 1253 |
| 7 | 5393 |
| 8 | 23441 |
| 9 | 102615 |
| 10 | 454053 |
| 11 | 2024967 |
| 12 | 9082141 |
| 13 | 40939483 |
| 14 | 185285179 |
| 15 | 841711683 |
| 16 | 3837192417 |
| 17 | 17544665249 |
| 18 | 80427480747 |
| 19 | 369547466415 |
| 20 | 1701549739581 |
| 21 | 7850015140409 |
| 22 | 36280336100217 |
| 23 | 167946604147073 |
| 24 | 778599094052733 |
| 25 | 3614513361418427 |
| 26 | 16801163253750261 |
| 27 | 78189094551663749 |
[1,1,5,19,73,297,1253,5393,23441,102615,454053, 2024967,9082141,40939483,185285179,841711683, 3837192417,17544665249,80427480747,369547466415, 1701549739581,7850015140409,36280336100217, 167946604147073,778599094052733,3614513361418427, 16801163253750261,78189094551663749] |