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A204964 Number of (n+2)X3 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally at least two different ways, and new values 0..1 introduced in row major order 1
166, 1001, 6086, 36522, 219755, 1323027, 7962992, 47928592, 288482790, 1736374118, 10451212777, 62905729186, 378628840855, 2278962509607, 13717048411662, 82562752244975, 496944229784914, 2991101444785801 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A204971
LINKS
FORMULA
Empirical: a(n) = 6*a(n-1) +6*a(n-3) -28*a(n-4) -25*a(n-5) +4*a(n-6) +2*a(n-7) +85*a(n-8) -46*a(n-9) +68*a(n-10) +46*a(n-11) -20*a(n-12) +12*a(n-13) -48*a(n-14) +16*a(n-15)
EXAMPLE
Some solutions for n=3
..0..0..1....0..1..0....0..0..0....0..0..1....0..0..0....0..0..0....0..1..0
..0..1..1....1..0..0....1..1..1....0..0..0....1..0..0....0..0..1....0..1..1
..1..1..1....1..0..0....1..1..1....1..1..0....0..1..1....1..0..1....0..1..1
..1..1..1....1..1..1....0..0..0....0..0..0....1..1..1....0..0..1....0..1..1
..1..1..1....1..0..1....0..1..1....0..0..0....0..0..1....1..1..1....0..1..1
CROSSREFS
Sequence in context: A051963 A033675 A204971 * A241969 A193984 A144380
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 21 2012
STATUS
approved

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Last modified March 19 06:29 EDT 2024. Contains 370953 sequences. (Running on oeis4.)