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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 10 |
| 6 | 30 |
| 7 | 50 |
| 8 | 160 |
| 9 | 265 |
| 10 | 873 |
| 11 | 1442 |
| 12 | 4851 |
| 13 | 7996 |
| 14 | 27300 |
| 15 | 44928 |
| 16 | 155115 |
| 17 | 254950 |
| 18 | 887910 |
| 19 | 1457852 |
| 20 | 5112767 |
| 21 | 8387170 |
| 22 | 29582886 |
| 23 | 48492028 |
| 24 | 171857127 |
| 25 | 281521541 |
| 26 | 1001762125 |
| 27 | 1640055250 |
| 28 | 5856231825 |
| 29 | 9582770760 |
| 30 | 34320863160 |
| 31 | 56135075250 |
[1,1,1,2,6,10,30,50,160,265,873,1442,4851,7996, 27300,44928,155115,254950,887910,1457852,5112767, 8387170,29582886,48492028,171857127,281521541, 1001762125,1640055250,5856231825,9582770760, 34320863160,56135075250] |