A233728 - OEIS

A233728

Number of (n+1)X(3+1) 0..3 arrays with every 2X2 subblock having the sum of the absolute values of the edge differences equal to 6 and no adjacent elements equal

556, 3972, 29816, 233432, 1851404, 14802604, 118695412, 953471940, 7663964828, 61629254552, 495650497344, 3986689001988, 32067041076200, 257939925202452, 2074814466960036, 16689518674136900, 134248084171273808

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OFFSET

1,1

COMMENTS

Column 3 of A233733

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) +46*a(n-2) -508*a(n-3) -481*a(n-4) +10680*a(n-5) -3945*a(n-6) -112548*a(n-7) +115263*a(n-8) +657688*a(n-9) -958275*a(n-10) -2192200*a(n-11) +4058993*a(n-12) +4067658*a(n-13) -9776097*a(n-14) -3651898*a(n-15) +13759514*a(n-16) +407041*a(n-17) -11221093*a(n-18) +1862871*a(n-19) +5154086*a(n-20) -1437504*a(n-21) -1269561*a(n-22) +444011*a(n-23) +147392*a(n-24) -60418*a(n-25) -4972*a(n-26) +2810*a(n-27) -123*a(n-28)

EXAMPLE

Some solutions for n=3

..3..2..0..3....1..3..1..0....3..2..3..1....1..3..1..3....0..1..0..1

..2..0..1..2....3..2..0..2....1..3..1..0....0..1..0..2....1..3..1..3

..3..1..3..1....0..1..2..3....0..2..3..2....2..3..2..1....0..2..0..2

..1..2..1..2....3..2..0..2....1..0..1..0....0..1..3..0....1..0..1..0

CROSSREFS

Sequence in context: A043511 A261432 A104809 * A233355 A371879 A177331

Adjacent sequences: A233725 A233726 A233727 * A233729 A233730 A233731

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 15 2013

STATUS

approved