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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 24 |
| 4 | 73 |
| 5 | 238 |
| 6 | 763 |
| 7 | 2436 |
| 8 | 7821 |
| 9 | 25050 |
| 10 | 80255 |
| 11 | 257200 |
| 12 | 824081 |
| 13 | 2640582 |
| 14 | 8461187 |
| 15 | 27111644 |
| 16 | 86872853 |
| 17 | 278363058 |
| 18 | 891946503 |
| 19 | 2858027016 |
| 20 | 9157854361 |
| 21 | 29344123550 |
| 22 | 94026132235 |
| 23 | 301283944500 |
| 24 | 965391362461 |
| 25 | 3093362593162 |
| 26 | 9911930522767 |
| 27 | 31760378496864 |
[1,2,7,24,73,238,763,2436,7821,25050,80255,257200, 824081,2640582,8461187,27111644,86872853, 278363058,891946503,2858027016,9157854361, 29344123550,94026132235,301283944500,965391362461, 3093362593162,9911930522767,31760378496864] |