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A186920 Number of (n+1)X7 0..3 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces 0
1567936, 1613838400, 686342587904, 380882328583712, 193942830390429600 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A186923

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions for 3X7

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

..0..0..0..1..1..0..0....0..0..0..1..0..0..1....0..0..0..1..1..1..0

..0..0..0..1..2..1..0....0..0..0..1..0..0..0....0..0..0..1..2..3..3

CROSSREFS

Sequence in context: A328563 A250517 A151620 * A185804 A252881 A183669

Adjacent sequences:  A186917 A186918 A186919 * A186921 A186922 A186923

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 28 2011

STATUS

approved

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Last modified November 30 21:20 EST 2021. Contains 349426 sequences. (Running on oeis4.)