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A209850 1/4 the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having one or four distinct clockwise edge differences 0
25, 2829, 1386131, 3111914707, 31192434742293, 1413503057063618368, 287490532338602681041344, 263539796114390477346345246841 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A209858

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A342107 A145246 A082488 * A014797 A077519 A078215

Adjacent sequences:  A209847 A209848 A209849 * A209851 A209852 A209853

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 14 2012

STATUS

approved

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Last modified November 26 17:52 EST 2021. Contains 349343 sequences. (Running on oeis4.)