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A180999 Number of n X n binary matrices with rows and columns each in strictly increasing order as binary numbers and each row and column having an odd number of 1s 0

%I #3 Dec 18 2015 18:17:26

%S 1,1,1,3,21,613,58894,17001258,14824281524,39871721434052

%N Number of n X n binary matrices with rows and columns each in strictly increasing order as binary numbers and each row and column having an odd number of 1s

%C Diagonal of A181000

%e All solutions for 4X4

%e ..0..0..0..1....0..0..0..1....0..1..1..1

%e ..0..0..1..0....0..0..1..0....1..0..1..1

%e ..0..1..0..0....0..1..1..1....1..1..0..1

%e ..1..0..0..0....1..0..1..1....1..1..1..0

%K nonn

%O 1,4

%A _R. H. Hardin_ Sep 30 2010

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Last modified March 29 05:48 EDT 2024. Contains 371265 sequences. (Running on oeis4.)