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A204489 Number of (n+2)X7 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly one way, and new values 0..1 introduced in row major order 1
4664, 5804, 11331, 22341, 43620, 85756, 168567, 334451, 672081, 1366044, 2793653, 5734032, 11833402, 24484245, 50644733, 105122828, 218567557, 454101052, 945848184, 1972351215, 4109094663, 8578179471, 17922597153, 37410414881 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A204492

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +a(n-2) +9*a(n-3) -5*a(n-4) -10*a(n-5) -7*a(n-6) -28*a(n-7) +17*a(n-8) -10*a(n-9) +52*a(n-10) -a(n-11) +6*a(n-12) -3*a(n-13) -14*a(n-14) +3*a(n-15) -17*a(n-16) +7*a(n-17) +4*a(n-18) -2*a(n-19) -4*a(n-21) +2*a(n-22) for n>32

EXAMPLE

Some solutions for n=3

..0..0..0..1..0..0..0....0..1..0..0..1..1..0....0..0..0..0..1..1..0

..0..1..0..0..1..0..1....1..1..1..0..0..1..1....0..1..1..0..0..1..1

..1..0..1..0..0..1..1....1..0..1..1..0..0..1....1..1..0..1..0..0..1

..0..1..0..1..0..0..0....0..1..0..1..1..0..0....0..1..1..0..1..0..1

..0..0..1..0..1..0..1....0..1..1..0..1..1..0....0..0..1..1..0..1..1

CROSSREFS

Sequence in context: A020422 A048131 A062626 * A252127 A188364 A236014

Adjacent sequences:  A204486 A204487 A204488 * A204490 A204491 A204492

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 15 2012

STATUS

approved

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Last modified January 19 22:04 EST 2022. Contains 350466 sequences. (Running on oeis4.)