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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 9 |
| 5 | 25 |
| 6 | 44 |
| 7 | 133 |
| 8 | 230 |
| 9 | 726 |
| 10 | 1242 |
| 11 | 4037 |
| 12 | 6853 |
| 13 | 22737 |
| 14 | 38376 |
| 15 | 129285 |
| 16 | 217242 |
| 17 | 740554 |
| 18 | 1239980 |
| 19 | 4266830 |
| 20 | 7123765 |
| 21 | 24701425 |
| 22 | 41141916 |
| 23 | 143567173 |
| 24 | 238637282 |
| 25 | 837212650 |
| 26 | 1389206210 |
| 27 | 4896136845 |
| 28 | 8112107475 |
| 29 | 28703894775 |
| 30 | 47495492400 |
| 31 | 168640510725 |
| 32 | 278722764954 |
[1,1,2,5,9,25,44,133,230,726,1242,4037,6853,22737, 38376,129285,217242,740554,1239980,4266830, 7123765,24701425,41141916,143567173,238637282, 837212650,1389206210,4896136845,8112107475, 28703894775,47495492400,168640510725,278722764954] |