A237013 Number of (n+1)X(6+1) 0..3 arrays with the sum of all four elements of every 2X2 subblock equal.

61472, 92328, 149608, 282048, 566936, 1274544, 2995048, 7603440, 19947032, 55347408, 157602088, 468497328, 1423485656, 4480816464, 14392051048, 47675263920, 160980618392, 558520484688, 1971390265768, 7118618309808

Offset

1,1

Comments

Column 6 of A237015

Links

R. H. Hardin, Table of n, a(n) for n = 1..28

Formula

Empirical: a(n) = 8*a(n-1) +16*a(n-2) -268*a(n-3) +189*a(n-4) +3388*a(n-5) -5824*a(n-6) -20048*a(n-7) +49756*a(n-8) +52752*a(n-9) -196896*a(n-10) -24192*a(n-11) +369216*a(n-12) -131328*a(n-13) -262656*a(n-14) +165888*a(n-15)

Example

Some solutions for n=3
..0..2..1..1..2..2..2....2..3..3..3..1..3..0....0..0..3..1..2..2..1
..3..1..2..2..1..1..1....1..1..0..1..2..1..3....3..2..0..1..1..0..2
..1..1..2..0..3..1..3....2..3..3..3..1..3..0....0..0..3..1..2..2..1
..3..1..2..2..1..1..1....1..1..0..1..2..1..3....3..2..0..1..1..0..2

Crossrefs

Sequence in context: A330508 A204395 A181261 * A340438 A253613 A257749

Adjacent sequences: A237010 A237011 A237012 * A237014 A237015 A237016

Keyword

nonn

Author

R. H. Hardin, Feb 02 2014

Status

approved