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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 6 |
| 4 | 96 |
| 5 | 600 |
| 6 | 1392 |
| 7 | 2156 |
| 8 | 10624 |
| 9 | 22410 |
| 10 | 62400 |
| 11 | 82280 |
| 12 | 210336 |
| 13 | 280540 |
| 14 | 495488 |
| 15 | 955950 |
| 16 | 1332736 |
| 17 | 1844976 |
| 18 | 2924640 |
| 19 | 3933456 |
| 20 | 6319200 |
| 21 | 7954170 |
| 22 | 10648000 |
| 23 | 14081980 |
| 24 | 19826304 |
| 25 | 25502500 |
| 26 | 31809856 |
| 27 | 41037354 |
| 28 | 52338272 |
| 29 | 63979916 |
| 30 | 84001200 |
| 31 | 98348740 |
| 32 | 123033600 |
[0,0,6,96,600,1392,2156,10624,22410,62400,82280, 210336,280540,495488,955950,1332736,1844976, 2924640,3933456,6319200,7954170,10648000,14081980, 19826304,25502500,31809856,41037354,52338272, 63979916,84001200,98348740,123033600] |