A231022 Number of (n+3)X(6+3) 0..3 black square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero

4584, 419878, 8838040, 859128648, 15744800360, 1576885946694, 29418861515276, 2914693904795344, 54302516885868700, 5395553101857678590, 100529076003975579204, 9982484206536849161276, 185992129163581425898076

Offset

1,1

Comments

Column 6 of A231023

Links

R. H. Hardin, Table of n, a(n) for n = 1..102

Example

Some solutions for n=2
..x..0..x..2..x..2..x..0..x....x..0..x..2..x..2..x..0..x
..3..x..1..x..3..x..1..x..3....1..x..3..x..3..x..1..x..3
..x..3..x..1..x..0..x..0..x....x..2..x..0..x..2..x..2..x
..0..x..2..x..0..x..2..x..3....1..x..3..x..1..x..3..x..1
..x..1..x..1..x..3..x..2..x....x..0..x..0..x..0..x..2..x

Crossrefs

Sequence in context: A252580 A230947 A205231 * A251385 A185470 A004537

Adjacent sequences: A231019 A231020 A231021 * A231023 A231024 A231025

Keyword

nonn

Author

R. H. Hardin, Nov 03 2013

Status

approved