A263872 - OEIS

A263872

Number of (n+1)X(7+1) 0..1 arrays with each row and column divisible by 3, read as a binary number with top and left being the most significant bits, and rows and columns lexicographically nondecreasing.

5, 5, 25, 41, 494, 2909, 62904, 525967, 8468941, 71260394, 850301770, 6589670154, 62160939006, 434482926964, 3416830587073, 21593530137906, 146883022822593, 846348872934578, 5108443008090443, 27076148532186899, 147708619212786406

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OFFSET

1,1

COMMENTS

Column 7 of A263873.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..60

EXAMPLE

Some solutions for n=4

..0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0

..0..0..1..1..1..1..1..1....0..0..0..0..1..1..1..1....0..0..0..0..0..0..0..0

..1..1..0..0..0..0..0..0....1..1..1..1..1..1..1..1....0..0..0..0..0..0..1..1