%I #6 Apr 18 2023 15:53:54
%S 17920,213920,1188294,2864828,2618602,1910774,918188,973994,798740,
%T 1339314,1508072,2300668,4527544
%N Number of (n+3) X (n+3) 0..1 arrays with no 4 X 4 subblock diagonal sum not equal the antidiagonal sum.
%C Diagonal of A258957.
%e Some solutions for n=1
%e ..0..0..1..1....1..0..0..0....1..0..0..0....0..0..0..0....1..0..1..0
%e ..0..1..0..1....1..0..1..0....1..1..1..1....0..0..1..0....1..0..0..0
%e ..0..1..1..0....0..0..1..0....0..1..0..1....0..0..1..0....1..1..0..1
%e ..1..0..1..1....1..1..0..0....0..1..1..0....1..1..1..1....0..0..1..0
%Y Cf. A258957.
%K nonn
%O 1,1
%A _R. H. Hardin_, Jun 15 2015