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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 15 |
| 3 | 21 |
| 4 | 45 |
| 5 | 91 |
| 6 | 990 |
| 7 | 1711 |
| 8 | 365085 |
| 9 | 401856 |
| 10 | 713415 |
| 11 | 785631 |
| 12 | 1079715 |
| 13 | 1326006 |
| 14 | 2355535 |
| 15 | 2888406 |
| 16 | 5137615 |
| 17 | 5666661 |
| 18 | 5764710 |
| 19 | 9550635 |
| 20 | 9921285 |
| 21 | 10934826 |
| 22 | 19434495 |
| 23 | 21421785 |
| 24 | 23622501 |
| 25 | 42003195 |
| 26 | 46315500 |
| 27 | 82349361 |
| 28 | 146384605 |
| 29 | 152259975 |
| 30 | 171578550 |
| 31 | 288300078 |
| 32 | 313137825 |
[6,15,21,45,91,990,1711,365085,401856,713415, 785631,1079715,1326006,2355535,2888406,5137615, 5666661,5764710,9550635,9921285,10934826,19434495, 21421785,23622501,42003195,46315500,82349361, 146384605,152259975,171578550,288300078,313137825] |