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A205992 Number of (n+1)X3 0..2 arrays with the number of clockwise edge increases in every 2X2 subblock equal to two, and every 2X2 determinant nonzero 1
92, 498, 2712, 14866, 81278, 445352, 2436706, 13344256, 73036756, 399888660, 2188990738, 11984113612, 65604360312, 359154388466, 1966148397354, 10763651700178, 58924772138404, 322581389428372, 1765951542920976 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A205998

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +17*a(n-2) -19*a(n-3) -4*a(n-4) +27*a(n-5) -13*a(n-6) +8*a(n-8) -4*a(n-9) for n>10

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A100170 A233311 A233309 * A200425 A107343 A231300

Adjacent sequences:  A205989 A205990 A205991 * A205993 A205994 A205995

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 02 2012

STATUS

approved

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Last modified April 19 11:58 EDT 2021. Contains 343114 sequences. (Running on oeis4.)