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A186868 Number of (n+1)X3 0..2 arrays with every 2X2 subblock sum equal to exactly one or two horizontal and vertical neighbor 2X2 subblock sums 1
171, 2121, 24414, 285724, 3409112, 40893800, 492154924, 5938127608, 71755699992, 868144018572, 10511898062464, 127364674658272, 1543896563706688, 18721690171445596, 227085751983499944, 2755034034648413220 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A186871

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

EXAMPLE

Some solutions for 5X3

..0..1..1....0..0..1....0..1..0....0..1..2....0..2..0....0..1..0....0..1..2

..2..1..1....1..2..1....2..2..0....1..1..2....2..2..0....1..1..1....1..2..0

..1..0..0....0..0..1....1..0..1....0..1..2....0..2..0....2..2..2....0..1..2

..0..2..0....1..2..1....0..2..0....2..2..2....0..1..0....0..2..0....2..1..2

..0..1..0....2..1..2....0..2..0....0..1..2....1..0..1....2..0..2....2..1..2

CROSSREFS

Sequence in context: A185838 A199902 A251223 * A185611 A195279 A016058

Adjacent sequences:  A186865 A186866 A186867 * A186869 A186870 A186871

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 27 2011

STATUS

approved

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Last modified October 18 12:18 EDT 2019. Contains 328160 sequences. (Running on oeis4.)