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 A220938 Equals two maps: number of 4Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..2 4Xn array 0
 1, 37, 556, 9107, 172904, 2876430, 49406891 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row 4 of A220935 LINKS Table of n, a(n) for n=1..7. EXAMPLE Some solutions for n=3 ..0..0..1....0..0..0....0..0..0....0..0..1....0..0..1....0..1..0....0..1..1 ..0..1..1....0..0..0....0..0..0....1..1..0....1..0..1....1..0..0....0..0..0 ..0..0..1....0..1..0....0..1..0....0..1..1....1..0..0....0..1..1....0..1..1 ..1..1..0....0..1..0....1..1..0....0..0..0....0..1..0....1..1..0....0..0..0 CROSSREFS Sequence in context: A006303 A219440 A219141 * A221292 A231514 A156226 Adjacent sequences: A220935 A220936 A220937 * A220939 A220940 A220941 KEYWORD nonn AUTHOR R. H. Hardin Dec 25 2012 STATUS approved

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Last modified June 2 22:56 EDT 2023. Contains 363102 sequences. (Running on oeis4.)