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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 10 |
| 3 | 20 |
| 4 | 36 |
| 5 | 60 |
| 6 | 94 |
| 7 | 140 |
| 8 | 204 |
| 9 | 292 |
| 10 | 474 |
| 11 | 756 |
| 12 | 1556 |
| 13 | 2600 |
| 14 | 5612 |
| 15 | 9404 |
| 16 | 21174 |
| 17 | 39896 |
| 18 | 95446 |
| 19 | 204960 |
| 20 | 486168 |
| 21 | 1076000 |
| 22 | 2392306 |
| 23 | 5215772 |
| 24 | 11042630 |
| 25 | 24216104 |
| 26 | 51067130 |
| 27 | 115069352 |
| 28 | 246871472 |
| 29 | 563237900 |
| 30 | 1216798802 |
| 31 | 2743669520 |
| 32 | 5908953208 |
| 33 | 13085409072 |
| 34 | 28224118088 |
| 35 | 61889692388 |
| 36 | 134885809852 |
[1,4,10,20,36,60,94,140,204,292,474,756,1556,2600, 5612,9404,21174,39896,95446,204960,486168,1076000, 2392306,5215772,11042630,24216104,51067130, 115069352,246871472,563237900,1216798802, 2743669520,5908953208,13085409072,28224118088, 61889692388,134885809852] |