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A275040 Number of 5Xn 0..2 arrays with no element equal to any value at offset (0,-1) (-1,-2) or (-2,0) and new values introduced in order 0..2. 1
12, 162, 450, 2334, 11624, 57984, 290927, 1465435, 7376949, 37148115, 187150874, 943024281, 4751935274, 23946771826, 120679612086, 608149528211, 3064647978801, 15443791732842, 77826897454970, 392197493948848 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 5 of A275037.

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) -27*a(n-2) +79*a(n-3) -99*a(n-4) -81*a(n-5) +860*a(n-6) -1162*a(n-7) -868*a(n-8) +1676*a(n-9) -3352*a(n-10) -1549*a(n-11) +4857*a(n-12) +1164*a(n-13) +3213*a(n-14) +5946*a(n-15) -1377*a(n-16) -5652*a(n-17) -4880*a(n-18) -2760*a(n-19) -710*a(n-20) +595*a(n-21) +1142*a(n-22) +594*a(n-23) +71*a(n-24) +48*a(n-25) +20*a(n-26) +a(n-28) for n>32

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Cf. A275037.

Sequence in context: A167558 A048609 A048603 * A109391 A138455 A024221

Adjacent sequences:  A275037 A275038 A275039 * A275041 A275042 A275043

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 14 2016

STATUS

approved

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Last modified July 25 10:40 EDT 2017. Contains 289792 sequences.