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A205928 Number of (n+1)X2 0..3 arrays with the number of clockwise edge increases in 2X2 subblocks nondecreasing rightwards and downwards 1
256, 3036, 32208, 319784, 3048544, 28259556, 256692580, 2295975140, 20290062176, 177581881904, 1541976728696, 13301510850956, 114108632607548, 974287139001676, 8285017042480392, 70205670884081960, 593085254039113280 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A205935
LINKS
FORMULA
Empirical: a(n) = 16*a(n-1) -63*a(n-2) -27*a(n-3) +182*a(n-4) -217*a(n-5) +114*a(n-6) -4*a(n-7) -4*a(n-8) +4*a(n-9)
EXAMPLE
Some solutions for n=4
..0..0....1..3....0..0....3..1....1..1....1..1....1..3....3..1....0..1....1..1
..1..3....1..3....1..0....1..3....3..3....2..2....1..0....1..2....1..2....1..2
..0..2....3..1....0..1....2..1....3..2....1..0....0..1....0..2....0..2....1..2
..0..3....1..3....1..3....1..2....0..0....0..3....0..2....0..3....2..1....3..0
..1..0....0..1....3..0....0..3....2..1....1..0....3..2....1..0....0..3....1..2
CROSSREFS
Sequence in context: A236199 A188823 A205935 * A235665 A235430 A235426
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 01 2012
STATUS
approved

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Last modified May 29 04:26 EDT 2024. Contains 372921 sequences. (Running on oeis4.)