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A206312 Number of (n+1)X3 0..3 arrays with the number of clockwise edge increases in every 2X2 subblock equal to two, and every 2X2 determinant nonzero 1
873, 14990, 258452, 4466450, 77132181, 1332632711, 23019152735, 397663246671, 6869398174303, 118667836512792, 2049943888882611, 35412251178185627, 611735705434058145, 10567560415916348461, 182551476583398721925 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A206318

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) +178*a(n-2) +165*a(n-3) -2824*a(n-4) -4379*a(n-5) +21326*a(n-6) +27124*a(n-7) -88175*a(n-8) -686*a(n-9) +173432*a(n-10) -238738*a(n-11) -152649*a(n-12) +854730*a(n-13) -1223471*a(n-14) +1084153*a(n-15) -644627*a(n-16) +130265*a(n-17) +200912*a(n-18) -253639*a(n-19) +210358*a(n-20) -155058*a(n-21) +94508*a(n-22) -47283*a(n-23) +17559*a(n-24) -3954*a(n-25) -565*a(n-26) +581*a(n-27) -71*a(n-28) +6*a(n-29)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A251841 A251085 A334011 * A252211 A045258 A252219

Adjacent sequences:  A206309 A206310 A206311 * A206313 A206314 A206315

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 06 2012

STATUS

approved

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Last modified October 26 00:52 EDT 2021. Contains 348256 sequences. (Running on oeis4.)