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A206162 Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock in a row having an equal number of equal diagonal or equal antidiagonal elements, adjacent rows differing in this number, and new values 0..3 introduced in row major order 0
15, 1070, 463878, 526154358, 4224315021758, 48801583349072774 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A206169

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for n=4

..0..0..0..0..1....0..1..0..0..0....0..0..0..0..1....0..0..0..0..0

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

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

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

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

CROSSREFS

Sequence in context: A241331 A205602 A233509 * A203409 A207980 A131313

Adjacent sequences:  A206159 A206160 A206161 * A206163 A206164 A206165

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 04 2012

STATUS

approved

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Last modified September 22 21:07 EDT 2020. Contains 337291 sequences. (Running on oeis4.)