A181261 Number of (n+2)X9 binary matrices with every 3X3 block having exactly four 1's

61398, 74784, 91122, 112500, 162882, 242784, 386406, 750312, 1548594, 3449484, 8634042, 22315320, 59561118, 166095504, 468837162, 1339623540, 3893978322, 11377279584, 33414823926, 98854539192, 293124225474, 871179943644

Offset

1,1

Comments

Column 7 of A181262

Links

R. H. Hardin, Table of n, a(n) for n=1..46

Example

Some solutions for 3X9
..0..0..1..0..0..1..0..0..1....0..0..0..1..0..0..0..0..1
..1..1..1..1..1..1..1..0..1....0..0..1..0..0..1..0..1..0
..0..0..0..0..0..0..0..1..0....1..1..1..0..1..1..1..0..1

Crossrefs

Sequence in context: A215599 A330508 A204395 * A237013 A340438 A253613

Adjacent sequences: A181258 A181259 A181260 * A181262 A181263 A181264

Keyword

nonn

Author

R. H. Hardin Oct 10 2010

Status

approved