A000215 - OEIS

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A000215 as a simple table

n	a(n)
0	3
1	5
2	17
3	257
4	65537
5	4294967297
6	18446744073709551617
7	340282366920938463463374607431768211457
8	115792089237316195423570985008687907853269984665640564039457584007913129639937

[3,5,17,257,65537,4294967297,18446744073709551617, 340282366920938463463374607431768211457, 11579208923731619542357098500868790785326998466564\ 0564039457584007913129639937]