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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 4 |
| 2 | 20 |
| 3 | 54 |
| 4 | 112 |
| 5 | 200 |
| 6 | 324 |
| 7 | 490 |
| 8 | 704 |
| 9 | 972 |
| 10 | 1300 |
| 11 | 1694 |
| 12 | 2160 |
| 13 | 2704 |
| 14 | 3332 |
| 15 | 4050 |
| 16 | 4864 |
| 17 | 5780 |
| 18 | 6804 |
| 19 | 7942 |
| 20 | 9200 |
| 21 | 10584 |
| 22 | 12100 |
| 23 | 13754 |
| 24 | 15552 |
| 25 | 17500 |
| 26 | 19604 |
| 27 | 21870 |
| 28 | 24304 |
| 29 | 26912 |
| 30 | 29700 |
| 31 | 32674 |
| 32 | 35840 |
| 33 | 39204 |
| 34 | 42772 |
| 35 | 46550 |
[0,4,20,54,112,200,324,490,704,972,1300,1694,2160, 2704,3332,4050,4864,5780,6804,7942,9200,10584, 12100,13754,15552,17500,19604,21870,24304,26912, 29700,32674,35840,39204,42772,46550] |