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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 121 |
| 3 | 144 |
| 4 | 4900 |
| 5 | 166464 |
| 6 | 5654884 |
| 7 | 192099600 |
| 8 | 6525731524 |
| 9 | 221682772224 |
| 10 | 7530688524100 |
| 11 | 255821727047184 |
| 12 | 8690408031080164 |
| 13 | 295218051329678400 |
| 14 | 10028723337177985444 |
| 15 | 340681375412721826704 |
[4,121,144,4900,166464,5654884,192099600, 6525731524,221682772224,7530688524100, 255821727047184,8690408031080164, 295218051329678400,10028723337177985444, 340681375412721826704] |