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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 16 |
| 2 | 120 |
| 3 | 576 |
| 4 | 2060 |
| 5 | 6048 |
| 6 | 15424 |
| 7 | 35200 |
| 8 | 73518 |
| 9 | 143280 |
| 10 | 263584 |
| 11 | 461376 |
| 12 | 775160 |
| 13 | 1256928 |
| 14 | 1973760 |
| 15 | 3017088 |
| 16 | 4503557 |
| 17 | 6572880 |
| 18 | 9411984 |
| 19 | 13249280 |
| 20 | 18340932 |
| 21 | 25034976 |
| 22 | 33739520 |
| 23 | 44879616 |
| 24 | 59057510 |
| 25 | 76949920 |
| 26 | 99212352 |
| 27 | 126838080 |
| 28 | 160884264 |
| 29 | 202296960 |
| 30 | 252645376 |
[1,16,120,576,2060,6048,15424,35200,73518,143280, 263584,461376,775160,1256928,1973760,3017088, 4503557,6572880,9411984,13249280,18340932, 25034976,33739520,44879616,59057510,76949920, 99212352,126838080,160884264,202296960,252645376] |