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A186871 T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock sum equal to exactly one or two horizontal and vertical neighbor 2X2 subblock sums 4
0, 171, 171, 361, 2121, 361, 3645, 24414, 24414, 3645, 13365, 285724, 431016, 285724, 13365, 94905, 3409112, 12048996, 12048996, 3409112, 94905, 424845, 40893800, 270129432, 630235528, 270129432, 40893800, 424845, 2682129, 492154924 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Table starts

.......0.......171........361........3645.......13365......94905.......424845

.....171......2121......24414......285724.....3409112...40893800....492154924

.....361.....24414.....431016....12048996...270129432.6869877312.162868019530

....3645....285724...12048996...630235528.30995088416

...13365...3409112..270129432.30995088416

...94905..40893800.6869877312

..424845.492154924

.2682129

LINKS

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

EXAMPLE

Some solutions for 4X3

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

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

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

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

CROSSREFS

Column 1 is A185610

Sequence in context: A243294 A015975 A292090 * A185614 A187140 A185845

Adjacent sequences:  A186868 A186869 A186870 * A186872 A186873 A186874

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Feb 27 2011

STATUS

approved

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Last modified October 2 06:43 EDT 2022. Contains 357191 sequences. (Running on oeis4.)