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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 4 |
| 3 | 24 |
| 4 | 84 |
| 5 | 220 |
| 6 | 480 |
| 7 | 924 |
| 8 | 1624 |
| 9 | 2664 |
| 10 | 4140 |
| 11 | 6160 |
| 12 | 8844 |
| 13 | 12324 |
| 14 | 16744 |
| 15 | 22260 |
| 16 | 29040 |
| 17 | 37264 |
| 18 | 47124 |
| 19 | 58824 |
| 20 | 72580 |
| 21 | 88620 |
| 22 | 107184 |
| 23 | 128524 |
| 24 | 152904 |
| 25 | 180600 |
| 26 | 211900 |
| 27 | 247104 |
| 28 | 286524 |
| 29 | 330484 |
| 30 | 379320 |
| 31 | 433380 |
| 32 | 493024 |
| 33 | 558624 |
| 34 | 630564 |
| 35 | 709240 |
| 36 | 795060 |
| 37 | 888444 |
[0,0,4,24,84,220,480,924,1624,2664,4140,6160,8844, 12324,16744,22260,29040,37264,47124,58824,72580, 88620,107184,128524,152904,180600,211900,247104, 286524,330484,379320,433380,493024,558624,630564, 709240,795060,888444] |