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%I #7 Mar 15 2015 01:45:39
%S 1,2,2,3,4,3,4,5,4,6,7,7,8,8,7,8,8,10,10,12,13,14,11,13,13,11,14,16,
%T 15,18,17,16,15,17,17,20,20,23,23,21,21,21,19,23,22,24,26,26,23,25,24,
%U 28,29,31,30,32,29,31,28,29,31
%N Alternating row sums of array A255250.
%C See A255250 for a comment on Gauss's circle problem in an octant and a link.
%F a(n) = sum((-1)^m*T(n, m), m=0..floor(n/sqrt(2))), n >= 0, with T(n, m) = A255250(n, m) = floor(sqrt(n^2 - m^2)) - (m-1).
%Y Cf. A255250.
%K nonn,easy
%O 0,2
%A _Wolfdieter Lang_, Mar 14 2015
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