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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 64 |
| 3 | 289 |
| 4 | 253541929 |
| 5 | 499477801 |
| 6 | 1260747049 |
| 7 | 14450203681 |
| 8 | 25391466409 |
| 9 | 256221229489 |
| 10 | 333456586849 |
| 11 | 341122579249 |
| 12 | 459926756041 |
| 13 | 911087431081 |
| 14 | 928731181849 |
| 15 | 1142288550841 |
| 16 | 2880002461249 |
| 17 | 2923070670601 |
| 18 | 3000305515321 |
| 19 | 4103999343889 |
| 20 | 4123226708329 |
| 21 | 4258977385441 |
[4,64,289,253541929,499477801,1260747049, 14450203681,25391466409,256221229489,333456586849, 341122579249,459926756041,911087431081, 928731181849,1142288550841,2880002461249, 2923070670601,3000305515321,4103999343889, 4123226708329,4258977385441] |