A205241 Number of (n+1)X4 0..2 arrays with the number of rightwards and downwards edge increases in each 2X2 subblock differing from the number in each of its horizontal and vertical neighbors.

2990, 36478, 515162, 7051340, 97718448, 1334713506, 18384097800, 251875514320, 3461757498588, 47498508227712, 652418339064389, 8955881958241476, 122986967957641438, 1688504461834087204, 23185409190832766293

Offset

1,1

Comments

Column 3 of A205246

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=4
..1..0..0..0....0..0..2..2....0..0..2..1....0..1..2..2....0..2..1..2
..1..2..0..0....1..2..0..0....1..2..0..0....0..0..1..1....1..1..1..1
..0..0..2..0....2..0..0..2....1..2..2..2....2..1..2..2....0..0..1..2
..1..1..2..0....2..2..1..2....1..0..0..1....1..0..2..0....2..0..1..0
..2..1..2..1....0..0..1..2....2..2..0..1....0..1..2..2....2..0..2..2

Crossrefs

Sequence in context: A108926 A159731 A221725 * A317398 A346221 A253962

Adjacent sequences: A205238 A205239 A205240 * A205242 A205243 A205244

Keyword

nonn

Author

R. H. Hardin, Jan 24 2012

Status

approved