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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 846 |
| 4 | 9932 |
| 5 | 47962 |
| 6 | 126397 |
| 7 | 262409 |
| 8 | 452766 |
| 9 | 707541 |
| 10 | 1017934 |
| 11 | 1387600 |
| 12 | 1813854 |
| 13 | 2296696 |
| 14 | 2836126 |
| 15 | 3432144 |
| 16 | 4084750 |
| 17 | 4793944 |
| 18 | 5559726 |
| 19 | 6382096 |
| 20 | 7261054 |
| 21 | 8196600 |
| 22 | 9188734 |
| 23 | 10237456 |
| 24 | 11342766 |
| 25 | 12504664 |
| 26 | 13723150 |
| 27 | 14998224 |
| 28 | 16329886 |
| 29 | 17718136 |
[0,0,846,9932,47962,126397,262409,452766,707541, 1017934,1387600,1813854,2296696,2836126,3432144, 4084750,4793944,5559726,6382096,7261054,8196600, 9188734,10237456,11342766,12504664,13723150, 14998224,16329886,17718136] |