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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
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
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Feb 27 2011
STATUS
approved

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Last modified February 22 20:29 EST 2024. Contains 370264 sequences. (Running on oeis4.)