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A198208 Number of 2nX8 0..3 arrays with values 0..3 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors 0
11029, 1660672, 276030525, 51432469614, 10120087499636 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A198209

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

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

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

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

CROSSREFS

Sequence in context: A156942 A325311 A164518 * A139409 A233789 A236151

Adjacent sequences:  A198205 A198206 A198207 * A198209 A198210 A198211

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 22 2011

STATUS

approved

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Last modified November 19 00:12 EST 2019. Contains 329310 sequences. (Running on oeis4.)