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%I #21 Jun 06 2019 09:56:22
%S 0,1,15,511,65535,33554431,68719476735,562949953421311,
%T 18446744073709551615,2417851639229258349412351,
%U 1267650600228229401496703205375,2658455991569831745807614120560689151,22300745198530623141535718272648361505980415
%N a(n) = 2^(n^2) - 1.
%C Number of grains for squared chessboards.
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Wheat_and_chessboard_problem">Wheat and chessboard problem</a>
%F a(n) = 2^(n^2) - 1 = A002416(n) - 1. - _Omar E. Pol_, Jun 11 2012
%e For usual 8×8 chessboard there are 2^{64}-1 = 18446744073709551615 grains.
%p a:= n-> 2^(n^2)-1:
%p seq(a(n), n=0..15);
%Y Cf. A000225, A002416.
%K nonn
%O 0,3
%A _Jani Melik_, Jun 06 2012
%E Better name from _Omar E. Pol_, Jun 11 2012
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