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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 2 |
| 6 | 8 |
| 7 | 12 |
| 8 | 30 |
| 9 | 40 |
| 10 | 86 |
| 11 | 110 |
| 12 | 245 |
| 13 | 315 |
| 14 | 756 |
| 15 | 980 |
| 16 | 2387 |
| 17 | 3080 |
| 18 | 7400 |
| 19 | 9480 |
| 20 | 22737 |
| 21 | 29040 |
| 22 | 70390 |
| 23 | 89870 |
| 24 | 219791 |
| 25 | 280423 |
| 26 | 688051 |
| 27 | 876603 |
| 28 | 2154347 |
| 29 | 2741102 |
| 30 | 6754580 |
| 31 | 8586788 |
| 32 | 21225758 |
| 33 | 26965808 |
| 34 | 66826712 |
[0,0,0,1,2,8,12,30,40,86,110,245,315,756,980,2387, 3080,7400,9480,22737,29040,70390,89870,219791, 280423,688051,876603,2154347,2741102,6754580, 8586788,21225758,26965808,66826712] |