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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 64 |
| 3 | 900 |
| 4 | 12100 |
| 5 | 155236 |
| 6 | 1932100 |
| 7 | 23444964 |
| 8 | 278956804 |
| 9 | 3265665316 |
| 10 | 37722185284 |
| 11 | 430853083236 |
| 12 | 4874266035076 |
| 13 | 54692207394724 |
| 14 | 609340042214596 |
| 15 | 6746970728882916 |
| 16 | 74302629109627396 |
| 17 | 814375880067172900 |
[4,64,900,12100,155236,1932100,23444964,278956804, 3265665316,37722185284,430853083236,4874266035076, 54692207394724,609340042214596,6746970728882916, 74302629109627396,814375880067172900] |