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A206089 Number of (n+1) X 4 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly two counterclockwise and two clockwise edge increases. 1
972, 2016, 4560, 13344, 33792, 86496, 240192, 608256, 1556928, 4323456, 10948608, 28024704, 77822208, 197074944, 504444672, 1400799744, 3547348992, 9080004096, 25214395392, 63852281856, 163440073728, 453859117056, 1149341073408 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A206094.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 18*a(n-3) for n>6.

EXAMPLE

Some solutions for n=4:

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

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

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

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

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

CROSSREFS

Sequence in context: A217161 A243861 A171771 * A217162 A203375 A183359

Adjacent sequences: A206086 A206087 A206088 * A206090 A206091 A206092

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 03 2012

STATUS

approved

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Last modified November 29 18:13 EST 2022. Contains 358431 sequences. (Running on oeis4.)