A186869 Number of (n+1)X4 0..2 arrays with every 2X2 subblock sum equal to exactly one or two horizontal and vertical neighbor 2X2 subblock sums.

361, 24414, 431016, 12048996, 270129432, 6869877312, 162868019530, 4042781079474, 97568985207226, 2401857269073876, 58373470048298950, 1431967704538476946, 34909706847661265062, 854981421174931771662

Offset

1,1

Comments

Column 3 of A186871

Links

R. H. Hardin, Table of n, a(n) for n = 1..39

Example

Some solutions for 3X4
..1..2..2..1....0..2..0..1....2..1..1..0....1..0..0..2....2..0..1..0
..2..1..1..2....2..0..2..1....1..0..0..1....0..0..1..0....0..1..2..1
..2..1..2..0....0..2..1..1....1..2..2..1....2..0..1..1....0..2..1..2

Crossrefs

Sequence in context: A231996 A302385 A303106 * A185612 A302957 A232081

Adjacent sequences: A186866 A186867 A186868 * A186870 A186871 A186872

Keyword

nonn

Author

R. H. Hardin, Feb 27 2011

Status

approved