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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 16 |
| 3 | 121 |
| 4 | 676 |
| 5 | 4356 |
| 6 | 3249 |
| 7 | 91204 |
| 8 | 14400 |
| 9 | 1418481 |
| 10 | 5837056 |
| 11 | 61009 |
| 12 | 18429849 |
| 13 | 243953161 |
| 14 | 252004 |
| 15 | 213393664 |
| 16 | 7785238756 |
| 17 | 24395316100 |
| 18 | 1026169 |
| 19 | 2288665600 |
| 20 | 207199756864 |
| 21 | 1717027605316 |
| 22 | 4145296 |
| 23 | 23298053769 |
| 24 | 4855359366144 |
| 25 | 94830864276996 |
| 26 | 247251975165504 |
[1,16,121,676,4356,3249,91204,14400,1418481, 5837056,61009,18429849,243953161,252004,213393664, 7785238756,24395316100,1026169,2288665600, 207199756864,1717027605316,4145296,23298053769, 4855359366144,94830864276996,247251975165504] |