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A210349 1/4 the number of (n+1)X3 0..3 arrays with every 2X2 subblock having one, two or three distinct clockwise edge differences 1
431, 13566, 423694, 13288986, 416960476, 13085817650, 410707536246, 12890620403588, 404592571598972, 12698808571519484, 398573456240825396, 12509901116822794985, 392644408257072821693, 12323809287572710045051 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A210355

LINKS

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

FORMULA

Empirical: a(n) = 55*a(n-1) -890*a(n-2) +4374*a(n-3) +14813*a(n-4) -179200*a(n-5) +198626*a(n-6) +1718220*a(n-7) -3858631*a(n-8) -4143905*a(n-9) +14290154*a(n-10) +1274736*a(n-11) -19132266*a(n-12) +4460692*a(n-13) +9184880*a(n-14) -3036040*a(n-15) -1419448*a(n-16) +517280*a(n-17) +1792*a(n-18) -4096*a(n-19) -128*a(n-20)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A142802 A003548 A179173 * A048961 A301645 A063463

Adjacent sequences:  A210346 A210347 A210348 * A210350 A210351 A210352

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 20 2012

STATUS

approved

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Last modified June 2 16:52 EDT 2020. Contains 334787 sequences. (Running on oeis4.)