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A207994 Number of nX5 0..2 arrays with new values 0..2 introduced in row major order and no element equal to any horizontal or vertical neighbor (colorings ignoring permutations of colors). 3
8, 81, 853, 9075, 96831, 1034073, 11045757, 117997043, 1260537911, 13466147569, 143857201093, 1536809621307, 16417559602831, 175386899980873, 1873638094198285, 20015860487662275, 213827138093982759 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A207997.

LINKS

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

Index entries for linear recurrences with constant coefficients, signature (16,-65,92,-48,8).

FORMULA

a(n) = 16*a(n-1) -65*a(n-2) +92*a(n-3) -48*a(n-4) +8*a(n-5).

G.f.: -x*(8-47*x+77*x^2-44*x^3+8*x^4) / ( -1+16*x-65*x^2+92*x^3-48*x^4+8*x^5 ). - R. J. Mathar, Nov 23 2015

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A055996 A324016 A068617 * A210127 A007778 A065440

Adjacent sequences:  A207991 A207992 A207993 * A207995 A207996 A207997

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 22 2012

STATUS

approved

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Last modified September 23 08:23 EDT 2021. Contains 347610 sequences. (Running on oeis4.)