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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 16 |
| 4 | 64 |
| 5 | 144 |
| 6 | 576 |
| 7 | 1296 |
| 8 | 3600 |
| 9 | 6084 |
| 10 | 15876 |
| 11 | 28224 |
| 12 | 82944 |
| 13 | 147456 |
| 14 | 298116 |
| 15 | 627264 |
| 16 | 1218816 |
| 17 | 2433600 |
| 18 | 4928400 |
| 19 | 9809424 |
| 20 | 19607184 |
| 21 | 39237696 |
| 22 | 78535044 |
| 23 | 158155776 |
| 24 | 316057284 |
| 25 | 633830976 |
| 26 | 1265509476 |
| 27 | 2532303684 |
| 28 | 5062891716 |
| 29 | 10128007044 |
| 30 | 20260106244 |
| 31 | 40519274436 |
| 32 | 81043841124 |
[1,4,16,64,144,576,1296,3600,6084,15876,28224, 82944,147456,298116,627264,1218816,2433600, 4928400,9809424,19607184,39237696,78535044, 158155776,316057284,633830976,1265509476, 2532303684,5062891716,10128007044,20260106244, 40519274436,81043841124] |