A222515 Number of 7Xn 0..1 arrays with exactly floor(7Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..1 order

0, 144, 1335, 15420, 128889, 2220730, 19892241, 385142640, 3707833063, 76288704212, 767768563690, 16265595620923, 167593171246145, 3601551682848558, 37565287343451014, 813220525871238420

Offset

1,2

Comments

Row 7 of A222509

Links

R. H. Hardin, Table of n, a(n) for n = 1..17

Example

Some solutions for n=3
..0..0..0....0..0..0....0..0..0....0..0..0....0..0..1....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..0
..0..0..1....0..0..0....0..0..0....1..0..0....0..0..0....0..0..0....0..0..0
..0..0..0....0..1..0....0..0..1....0..0..1....0..0..0....0..0..0....0..0..0
..0..0..1....0..1..1....1..0..0....1..0..0....1..0..1....0..1..0....0..0..1
..0..0..1....1..1..1....0..1..0....0..0..0....0..0..0....0..0..1....0..1..1
..1..0..0....0..1..1....1..1..1....0..0..1....1..0..0....0..0..1....0..0..1

Crossrefs

Sequence in context: A203826 A261655 A203819 * A023096 A223435 A169859

Adjacent sequences: A222512 A222513 A222514 * A222516 A222517 A222518

Keyword

nonn

Author

R. H. Hardin Feb 23 2013

Status

approved