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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 18 |
| 4 | 80 |
| 5 | 200 |
| 6 | 420 |
| 7 | 756 |
| 8 | 1472 |
| 9 | 2358 |
| 10 | 3860 |
| 11 | 5500 |
| 12 | 8304 |
| 13 | 11232 |
| 14 | 15484 |
| 15 | 21090 |
| 16 | 27392 |
| 17 | 34816 |
| 18 | 44604 |
| 19 | 55404 |
| 20 | 69840 |
| 21 | 84294 |
| 22 | 102124 |
| 23 | 122452 |
| 24 | 147264 |
| 25 | 173800 |
| 26 | 203476 |
| 27 | 237762 |
| 28 | 276752 |
| 29 | 318304 |
| 30 | 368340 |
| 31 | 418500 |
| 32 | 478208 |
| 33 | 541398 |
| 34 | 611524 |
| 35 | 689780 |
| 36 | 774576 |
| 37 | 863136 |
| 38 | 963148 |
[0,4,18,80,200,420,756,1472,2358,3860,5500,8304, 11232,15484,21090,27392,34816,44604,55404,69840, 84294,102124,122452,147264,173800,203476,237762, 276752,318304,368340,418500,478208,541398,611524, 689780,774576,863136,963148] |