A183847 Number of (n+1)X3 0..3 arrays with each element of every 2X2 subblock being the sum mod 4 of two others

107, 429, 1766, 7453, 31767, 136894, 591211, 2568541, 11149598, 48599949, 211414495, 922928662, 4019038203, 17560067093, 76517548422, 334524327261, 1458399643111, 6379140858958, 27822538200459, 121753363003213

Offset

1,1

Comments

Column 2 of A183854

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Formula

Empirical: a(n)=8*a(n-1)+5*a(n-2)-180*a(n-3)+373*a(n-4)+420*a(n-5)-1862*a(n-6)+1280*a(n-7)+660*a(n-8)-912*a(n-9)+216*a(n-10)

Example

Some solutions for 5X3
..3..2..1....1..2..1....2..2..2....1..3..1....3..2..3....0..2..2....2..0..2
..1..1..3....1..3..3....2..0..2....2..1..2....1..3..1....2..0..0....0..2..0
..2..3..2....1..2..1....2..2..0....1..3..1....2..3..2....2..0..0....2..0..2
..1..1..3....3..3..1....0..2..0....3..2..1....1..1..3....2..2..2....2..0..2
..3..2..1....2..1..2....2..2..0....1..1..3....3..2..1....2..0..0....0..2..2

Crossrefs

Sequence in context: A139989 A059699 A142421 * A142696 A142775 A200933

Adjacent sequences: A183844 A183845 A183846 * A183848 A183849 A183850

Keyword

nonn

Author

R. H. Hardin Jan 07 2011

Status

approved