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A186921 Number of (n+1)X8 0..3 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces 0
10419200, 30161413056, 28533024476512, 37393297725524928, 43448233709038001344 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A186923

LINKS

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

EXAMPLE

Some solutions for 3X8

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

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

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

CROSSREFS

Sequence in context: A159837 A241791 A234198 * A185805 A306476 A251640

Adjacent sequences:  A186918 A186919 A186920 * A186922 A186923 A186924

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 28 2011

STATUS

approved

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Last modified November 26 20:36 EST 2021. Contains 349343 sequences. (Running on oeis4.)