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| n | a(n) |
|---|---|
| 1 | 20 |
| 2 | 400 |
| 3 | 6446 |
| 4 | 101628 |
| 5 | 1579664 |
| 6 | 24496092 |
| 7 | 379515360 |
| 8 | 5878642448 |
| 9 | 91053926856 |
| 10 | 1410308064720 |
| 11 | 21843768123936 |
| 12 | 338330131913680 |
| 13 | 5240270191277760 |
| 14 | 81164599671831296 |
| 15 | 1257128330483644640 |
| 16 | 19471193573584406720 |
[20,400,6446,101628,1579664,24496092,379515360, 5878642448,91053926856,1410308064720, 21843768123936,338330131913680,5240270191277760, 81164599671831296,1257128330483644640, 19471193573584406720] |