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A185570 Number of (n+1)X4 0..3 arrays with every 2X2 subblock sum equal to some horizontal or vertical neighbor 2X2 subblock sum 0
1936, 319448, 13565936, 886180500, 48714917964, 2946419096704, 170291132595760, 10155464818201668 (list; graph; refs; listen; history; text; internal format)
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: A227491 A237010 A188369 * A031766 A031632 A031542

Adjacent sequences:  A185567 A185568 A185569 * A185571 A185572 A185573

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 31 2011

STATUS

approved

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Last modified April 18 19:03 EDT 2014. Contains 240733 sequences.