A251066 Number of (2+1)X(n+1) 0..2 arrays with no 2X2 subblock having x11-x00 less than x10-x01

336, 2740, 17129, 89429, 410718, 1716324, 6678657, 24601591, 86829924, 296316228, 984577369, 3202676417, 10242533906, 32315864964, 100861744449, 312101151267, 959163561400, 2931830099988, 8923446044937, 27069106904461, 81899632621478

Offset

1,1

Comments

Row 2 of A251065

Links

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

Formula

Empirical: a(n) = 18*a(n-1) -146*a(n-2) +706*a(n-3) -2268*a(n-4) +5102*a(n-5) -8246*a(n-6) +9654*a(n-7) -8131*a(n-8) +4808*a(n-9) -1896*a(n-10) +448*a(n-11) -48*a(n-12)

Example

Some solutions for n=4
..2..2..2..1..2....0..0..0..0..0....1..2..2..1..2....0..0..1..1..1
..0..0..0..1..2....0..0..0..2..2....0..0..1..2..1....1..2..1..2..2
..0..1..2..1..0....2..2..2..1..1....2..2..1..0..2....1..0..2..1..2

Crossrefs

Sequence in context: A237862 A268807 A159206 * A269050 A184557 A337873

Adjacent sequences: A251063 A251064 A251065 * A251067 A251068 A251069

Keyword

nonn

Author

R. H. Hardin, Nov 29 2014

Status

approved