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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 24 |
| 4 | 78 |
| 5 | 300 |
| 6 | 1248 |
| 7 | 4957 |
| 8 | 19372 |
| 9 | 76895 |
| 10 | 305672 |
| 11 | 1209771 |
| 12 | 4789866 |
| 13 | 18985256 |
| 14 | 75228302 |
| 15 | 298018487 |
| 16 | 1180748188 |
| 17 | 4678314418 |
| 18 | 18535510324 |
| 19 | 73437503198 |
| 20 | 290961862062 |
| 21 | 1152799708533 |
| 22 | 4567414655824 |
| 23 | 18096197850597 |
| 24 | 71697579703986 |
| 25 | 284067484743757 |
| 26 | 1125481884043816 |
[1,4,24,78,300,1248,4957,19372,76895,305672, 1209771,4789866,18985256,75228302,298018487, 1180748188,4678314418,18535510324,73437503198, 290961862062,1152799708533,4567414655824, 18096197850597,71697579703986,284067484743757, 1125481884043816] |