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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 4 |
| 2 | 1 |
| 3 | 105 |
| 4 | 330 |
| 5 | 385 |
| 6 | 770 |
| 7 | 1365 |
| 8 | 1995 |
| 9 | 1785 |
| 10 | 3570 |
| 11 | 5610 |
| 12 | 2805 |
| 13 | 6279 |
| 14 | 3135 |
| 15 | 14245 |
| 16 | 13209 |
| 17 | 6545 |
| 18 | 7917 |
| 19 | 12903 |
| 20 | 17017 |
| 21 | 21385 |
| 22 | 22715 |
| 23 | 11165 |
| 24 | 22015 |
| 25 | 21505 |
| 26 | 29393 |
| 27 | 20930 |
| 28 | 10465 |
| 29 | 16555 |
| 30 | 31395 |
| 31 | 19285 |
| 32 | 38570 |
| 33 | 37961 |
| 34 | 35581 |
| 35 | 52535 |
| 36 | 35105 |
| 37 | 75361 |
| 38 | 18445 |
| 39 | 35245 |
| 40 | 23205 |
| 41 | 46345 |
[2,4,1,105,330,385,770,1365,1995,1785,3570,5610, 2805,6279,3135,14245,13209,6545,7917,12903,17017, 21385,22715,11165,22015,21505,29393,20930,10465, 16555,31395,19285,38570,37961,35581,52535,35105, 75361,18445,35245,23205,46345] |