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 A275186 Number of 6 X n 0..2 arrays with no element equal to any value at offset (-2,-1) (-1,0) or (-1,1) and new values introduced in order 0..2. 1
 16, 37, 181, 914, 4603, 23313, 117916, 596625, 3018913, 15274618, 77286999, 391054261, 1978648444, 10011529573, 50656125413, 256308871218, 1296866472387, 6561859014441, 33201563019036, 167992603723721, 850005614599481 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 2*a(n-1) + 12*a(n-2) + 19*a(n-3) - 4*a(n-4) - 12*a(n-5) - 16*a(n-6) for n>7. Empirical g.f.: x*(16 + 5*x - 85*x^2 - 196*x^3 - 36*x^4 + 40*x^5 + 112*x^6) / ((1 - x)*(1 - x - 13*x^2 - 32*x^3 - 28*x^4 - 16*x^5)). - Colin Barker, Feb 01 2019 EXAMPLE Some solutions for n=4: ..0..0..1..2. .0..0..1..2. .0..0..1..1. .0..0..1..2. .0..1..2..0 ..2..2..0..1. .2..2..0..1. .1..2..0..0. .1..2..0..1. .2..0..1..2 ..1..1..2..2. .1..1..2..2. .0..1..2..2. .0..1..2..2. .1..2..0..1 ..2..0..0..1. .0..0..1..1. .2..0..0..1. .2..0..1..1. .0..1..2..0 ..1..2..2..0. .2..2..0..0. .1..2..2..0. .1..2..2..0. .2..0..1..2 ..0..1..1..2. .1..1..1..2. .0..1..1..1. .0..0..1..2. .1..2..0..1 CROSSREFS Row 6 of A275183. Sequence in context: A068833 A116190 A070587 * A224745 A070586 A166112 Adjacent sequences:  A275183 A275184 A275185 * A275187 A275188 A275189 KEYWORD nonn AUTHOR R. H. Hardin, Jul 19 2016 STATUS approved

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Last modified December 4 02:40 EST 2021. Contains 349469 sequences. (Running on oeis4.)