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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 5 |
| 2 | 17 |
| 3 | 56 |
| 4 | 185 |
| 5 | 611 |
| 6 | 2018 |
| 7 | 6665 |
| 8 | 22013 |
| 9 | 72704 |
| 10 | 240125 |
| 11 | 793079 |
| 12 | 2619362 |
| 13 | 8651165 |
| 14 | 28572857 |
| 15 | 94369736 |
| 16 | 311682065 |
| 17 | 1029415931 |
| 18 | 3399929858 |
| 19 | 11229205505 |
| 20 | 37087546373 |
| 21 | 122491844624 |
| 22 | 404563080245 |
| 23 | 1336181085359 |
| 24 | 4413106336322 |
| 25 | 14575500094325 |
| 26 | 48139606619297 |
[2,5,17,56,185,611,2018,6665,22013,72704,240125, 793079,2619362,8651165,28572857,94369736, 311682065,1029415931,3399929858,11229205505, 37087546373,122491844624,404563080245, 1336181085359,4413106336322,14575500094325, 48139606619297] |