%I #12 May 08 2023 15:08:24
%S 0,1,32,2304,524288,419430400,1236950581248,13792273858822144,
%T 590295810358705651712,97922991388784963151200256,
%U 63382530011411470074835160268800
%N a(n) = n^2*2^(n^2-1).
%C a(n) is the number of elements (ordered pairs) in all binary relations on {1,2,...,n}.
%C Equivalently a(n) is the number of 1's in all n X n {0,1} matrices.
%H G. C. Greubel, <a href="/A185968/b185968.txt">Table of n, a(n) for n = 0..57</a>
%t Table[n^2 *2^(n^2-1),{n,0,10}]
%o (PARI) for(n=0,25, print1(n^2 *2^(n^2-1), ", ")) \\ _G. C. Greubel_, Jul 23 2017
%Y Cf. A175716.
%K nonn
%O 0,3
%A _Geoffrey Critzer_, Feb 07 2011