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A206189 Number of (n+1)X(n+1) 0..3 arrays with the number of clockwise edge increases in every 2X2 subblock equal to two 0
124, 18172, 13173864, 46704516192, 806129409968360, 67595116900832029672, 27501116060342502948845780, 54245028887229452020237690008284 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A206197

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A035816 A206077 A097842 * A299828 A280905 A146516

Adjacent sequences:  A206186 A206187 A206188 * A206190 A206191 A206192

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 04 2012

STATUS

approved

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Last modified November 16 17:25 EST 2019. Contains 329201 sequences. (Running on oeis4.)