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A186922 Number of (n+1)X9 0..3 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces 0
85438016, 563483938112, 1225810619871552, 3676830716968217056, 9921625782478580791520 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 8 of A186923

LINKS

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

EXAMPLE

Some solutions for 3X9

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

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

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

CROSSREFS

Sequence in context: A186091 A295465 A230794 * A185806 A115534 A138030

Adjacent sequences:  A186919 A186920 A186921 * A186923 A186924 A186925

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 28 2011

STATUS

approved

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Last modified October 14 02:29 EDT 2019. Contains 327995 sequences. (Running on oeis4.)