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 A232033 Number of (n+1)X(3+1) 0..1 arrays with every element equal to some horizontal, vertical or antidiagonal neighbor, with top left element zero 1
 37, 521, 6958, 94102, 1272579, 17207275, 232668433, 3146033503, 42539187117, 575194892084, 7777514958284, 105163901425917, 1421976842496639, 19227302460062857, 259982546017978714, 3515361781736396370 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 3 of A232038 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 16*a(n-1) -32*a(n-2) -23*a(n-3) +30*a(n-4) +49*a(n-5) +160*a(n-6) -163*a(n-7) -304*a(n-8) +146*a(n-9) +59*a(n-10) +316*a(n-11) -147*a(n-12) -255*a(n-13) +70*a(n-14) +122*a(n-15) -21*a(n-16) -28*a(n-17) +2*a(n-18) +5*a(n-19) -a(n-20) EXAMPLE Some solutions for n=4 ..0..0..1..1....0..0..1..0....0..1..0..1....0..0..0..1....0..0..0..0 ..1..1..1..0....1..1..0..0....0..1..0..1....1..0..0..1....1..1..0..1 ..0..1..0..1....1..0..0..1....1..1..0..1....1..1..1..1....0..1..0..1 ..0..1..1..0....1..1..0..1....1..0..0..1....1..1..1..1....0..1..0..1 ..1..1..1..0....1..1..0..0....1..0..0..1....1..0..0..1....0..1..0..0 CROSSREFS Sequence in context: A142764 A256811 A123035 * A006303 A219440 A219141 Adjacent sequences: A232030 A232031 A232032 * A232034 A232035 A232036 KEYWORD nonn AUTHOR R. H. Hardin, Nov 17 2013 STATUS approved

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Last modified June 4 10:24 EDT 2023. Contains 363121 sequences. (Running on oeis4.)