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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 5 |
| 3 | 24 |
| 4 | 81 |
| 5 | 298 |
| 6 | 1070 |
| 7 | 3868 |
| 8 | 13960 |
| 9 | 50417 |
| 10 | 182084 |
| 11 | 657707 |
| 12 | 2375894 |
| 13 | 8583264 |
| 14 | 31009890 |
| 15 | 112038032 |
| 16 | 404803299 |
| 17 | 1462624643 |
| 18 | 5284813128 |
| 19 | 19095564020 |
| 20 | 68998567080 |
| 21 | 249316670981 |
| 22 | 900876831495 |
| 23 | 3255230444720 |
| 24 | 11762504284218 |
| 25 | 42502963168784 |
| 26 | 153581776819904 |
[1,3,5,24,81,298,1070,3868,13960,50417,182084, 657707,2375894,8583264,31009890,112038032, 404803299,1462624643,5284813128,19095564020, 68998567080,249316670981,900876831495, 3255230444720,11762504284218,42502963168784, 153581776819904] |