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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 20 |
| 4 | 48 |
| 5 | 112 |
| 6 | 188 |
| 7 | 300 |
| 8 | 448 |
| 9 | 704 |
| 10 | 972 |
| 11 | 1276 |
| 12 | 1616 |
| 13 | 2064 |
| 14 | 2548 |
| 15 | 3140 |
| 16 | 3840 |
| 17 | 4864 |
| 18 | 5900 |
| 19 | 6972 |
| 20 | 8080 |
| 21 | 9296 |
| 22 | 10548 |
| 23 | 11908 |
| 24 | 13376 |
| 25 | 15168 |
| 26 | 16996 |
| 27 | 18932 |
| 28 | 20976 |
| 29 | 23344 |
| 30 | 25820 |
| 31 | 28620 |
| 32 | 31744 |
| 33 | 35840 |
| 34 | 39948 |
| 35 | 44092 |
| 36 | 48272 |
| 37 | 52560 |
| 38 | 56884 |
| 39 | 61316 |
| 40 | 65856 |
[0,4,20,48,112,188,300,448,704,972,1276,1616,2064, 2548,3140,3840,4864,5900,6972,8080,9296,10548, 11908,13376,15168,16996,18932,20976,23344,25820, 28620,31744,35840,39948,44092,48272,52560,56884, 61316,65856] |