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A209779 Half the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having exactly one duplicate clockwise edge difference 0
64, 12492, 13606964, 89046135210, 3413352967754696, 774627496109684203370, 1034141529418861531701953000, 8145663030420623706384712975053986 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A209787

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A268055 A268078 A202548 * A220300 A316485 A292025

Adjacent sequences:  A209776 A209777 A209778 * A209780 A209781 A209782

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 13 2012

STATUS

approved

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Last modified February 17 17:59 EST 2020. Contains 331999 sequences. (Running on oeis4.)