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%I #9 Mar 07 2020 00:47:37
%S 0,0,0,0,1,0,0,1,1,0,0,0,0,0,0,0,1,0,0,1,0,0,0,0,-1,0,0,0,0,1,0,0,0,0,
%T 1,0,0,0,0,-1,0,-1,0,0,0,0,0,-1,-1,-1,-1,-1,-1,0,0,0,0,-1,-2,-1,-2,-1,
%U -2,-1,0,0
%N Array a(m,n) = pi(m+n) - pi(m) - pi(n) read by antidiagonals, where pi() = A000720 (m,n >= 0).
%C A212210-A212213 are the preferred versions of this array.
%e Beginning of array is
%e 0 0 0 0 0 0 0 0 ...
%e 0 1 1 0 1 0 1 0 ...
%e 0 1 0 0 0 0 -1 ...
%e 0 0 0 -1 0 -1 -1 ...
%e ...
%Y Cf. A047886, A212210-A212213, A000720.
%K sign,tabl,easy
%O 0,59
%A _N. J. A. Sloane_
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