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A119561 as a simple table

na(n)
04
17
221
3265
465553
54294967329
618446744073709551681
7340282366920938463463374607431768211585
8115792089237316195423570985008687907853269984665640564039457584007913129640193

[4,7,21,265,65553,4294967329,18446744073709551681,
 340282366920938463463374607431768211585,
 11579208923731619542357098500868790785326998466564\
 0564039457584007913129640193]