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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 177 |
| 3 | 712 |
| 4 | 31505 |
| 5 | 126732 |
| 6 | 5607713 |
| 7 | 22557584 |
| 8 | 998141409 |
| 9 | 4015123220 |
| 10 | 177663563089 |
| 11 | 714669375576 |
| 12 | 31623116088433 |
| 13 | 127207133729308 |
| 14 | 5628737000177985 |
| 15 | 22642155134441248 |
| 16 | 1001883562915592897 |
| 17 | 4030176406796812836 |
| 18 | 178329645461975357681 |
| 19 | 717348758254698243560 |
[1,4,177,712,31505,126732,5607713,22557584, 998141409,4015123220,177663563089,714669375576, 31623116088433,127207133729308,5628737000177985, 22642155134441248,1001883562915592897, 4030176406796812836,178329645461975357681, 717348758254698243560] |