A267248 - OEIS

%I #3 Jan 12 2016 09:10:12

%S 6,63,486,3351,20040,107015,516084,2278687,9303052,35428544,126753732,

%T 428651446,1377310514,4223642819,12409437728,35050866249,95459908872,

%U 251341796912,641282264972,1588863292072

%N Number of 5Xn binary arrays with row sums nondecreasing and columns lexicographically nondecreasing.

%C Row 5 of A267245.

%e Some solutions for n=4

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

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

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

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

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

%Y Cf. A267245.

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 12 2016