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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 4 |
| 3 | 24 |
| 4 | 80 |
| 5 | 200 |
| 6 | 420 |
| 7 | 784 |
| 8 | 1344 |
| 9 | 2160 |
| 10 | 3300 |
| 11 | 4840 |
| 12 | 6864 |
| 13 | 9464 |
| 14 | 12740 |
| 15 | 16800 |
| 16 | 21760 |
| 17 | 27744 |
| 18 | 34884 |
| 19 | 43320 |
| 20 | 53200 |
| 21 | 64680 |
| 22 | 77924 |
| 23 | 93104 |
| 24 | 110400 |
| 25 | 130000 |
| 26 | 152100 |
| 27 | 176904 |
| 28 | 204624 |
| 29 | 235480 |
| 30 | 269700 |
| 31 | 307520 |
| 32 | 349184 |
| 33 | 394944 |
| 34 | 445060 |
| 35 | 499800 |
| 36 | 559440 |
[0,0,4,24,80,200,420,784,1344,2160,3300,4840,6864, 9464,12740,16800,21760,27744,34884,43320,53200, 64680,77924,93104,110400,130000,152100,176904, 204624,235480,269700,307520,349184,394944,445060, 499800,559440] |