A185570 Number of (n+1)X4 0..3 arrays with every 2X2 subblock sum equal to some horizontal or vertical neighbor 2X2 subblock sum

1936, 319448, 13565936, 886180500, 48714917964, 2946419096704, 170291132595760, 10155464818201668

Offset

1,1

Comments

Column 3 of A185571

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A256765 A264109 A188369 * A367679 A031766 A031542

Adjacent sequences: A185567 A185568 A185569 * A185571 A185572 A185573

Keyword

nonn

Author

R. H. Hardin Jan 31 2011

Status

approved