A205928 Number of (n+1)X2 0..3 arrays with the number of clockwise edge increases in 2X2 subblocks nondecreasing rightwards and downwards

256, 3036, 32208, 319784, 3048544, 28259556, 256692580, 2295975140, 20290062176, 177581881904, 1541976728696, 13301510850956, 114108632607548, 974287139001676, 8285017042480392, 70205670884081960, 593085254039113280

Offset

1,1

Comments

Column 1 of A205935

Links

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

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

Adjacent sequences: A205925 A205926 A205927 * A205929 A205930 A205931

Keyword

nonn

Author

R. H. Hardin Feb 01 2012

Status

approved