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%I #7 Feb 18 2024 01:27:16
%S 1,-2,1,-2,1,1,1,0,0,1,-2,-2,1,0,1,4,0,0,0,0,1,-2,-2,0,1,0,0,1,0,0,-2,
%T 0,0,0,0,1,1,1,0,0,1,0,0,0,1,4,0,0,0,0,0,0,0,0,1,-2,-2,-2,-2,0,1,0,0,
%U 0,0,1,-2,0,0,0,0,0,0,0,0,0,0,1,-2,4,0,0,0,0,1,0,0,0,0,0,1,4,0,1
%N Square array read by antidiagonals up. Redheffer type matrix. A007427 interleaved with k-1 zeros in the columns.
%C The determinant of this matrix is A006218.
%e Table begins:
%e ..1..1..1..1..1..1..1..1
%e .-2..1..0..0..0..0..0..0
%e .-2..0..1..0..0..0..0..0
%e ..1.-2..0..1..0..0..0..0
%e .-2..0..0..0..1..0..0..0
%e ..4.-2.-2..0..0..1..0..0
%e .-2..0..0..0..0..0..1..0
%e ..0..1..0.-2..0..0..0..1
%o (Excel) =if(row()=1;1;if(mod(row();column())=0;1*lookup(row()/column();A000027;A007427);0))
%Y Cf. A007427, A006218, A002321.
%K sign,tabl
%O 1,2
%A _Mats Granvik_, Jun 19 2009
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