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A204481 Number of (n+2)X8 0..3 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly three ways, and new values 0..3 introduced in row major order 1
24718, 29959, 9290, 11364, 11338, 18410, 47369, 133889, 481694, 1808046, 6765672, 25621498, 97131639, 368034455, 1395284106, 5289949408, 20055106670, 76034602906, 288269180957, 1092909631093, 4143534785206, 15709333424602 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A204483

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +a(n-2) -2*a(n-3) -19*a(n-4) -4*a(n-5) +21*a(n-6) +24*a(n-7) +3*a(n-8) -18*a(n-9) -9*a(n-10) for n>13

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A189184 A321148 A216069 * A052356 A334024 A184093

Adjacent sequences:  A204478 A204479 A204480 * A204482 A204483 A204484

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 15 2012

STATUS

approved

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Last modified December 3 05:05 EST 2021. Contains 349445 sequences. (Running on oeis4.)