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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | 7 |
| 8 | 28 |
| 9 | 84 |
| 10 | 210 |
| 11 | 462 |
| 12 | 924 |
| 13 | 1716 |
| 14 | 3003 |
| 15 | 5005 |
| 16 | 8008 |
| 17 | 12376 |
| 18 | 18564 |
| 19 | 27132 |
| 20 | 38760 |
| 21 | 54264 |
| 22 | 74613 |
| 23 | 100947 |
| 24 | 134596 |
| 25 | 177100 |
| 26 | 230230 |
| 27 | 296010 |
| 28 | 376740 |
| 29 | 475020 |
| 30 | 593775 |
| 31 | 736281 |
| 32 | 906192 |
| 33 | 1107568 |
| 34 | 1344904 |
| 35 | 1623160 |
| 36 | 1947792 |
| 37 | 2324784 |
| 38 | 2760681 |
| 39 | 3262623 |
[0,0,0,0,0,0,1,7,28,84,210,462,924,1716,3003,5005, 8008,12376,18564,27132,38760,54264,74613,100947, 134596,177100,230230,296010,376740,475020,593775, 736281,906192,1107568,1344904,1623160,1947792, 2324784,2760681,3262623] |