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 A208711 Number of 4Xn 0..1 arrays with new values 0..1 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors 1
 8, 128, 1372, 16084, 185344, 2142580, 24754628, 286034292, 3305009328, 38188137788, 441249345280, 5098468022268, 58910854227068, 680692462409636, 7865141904908344, 90878716312611076, 1050068921631026592 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 4 of A208709 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 9*a(n-1) +31*a(n-2) -11*a(n-3) -71*a(n-4) -a(n-5) +38*a(n-6) -8*a(n-7) for n>9 EXAMPLE Some solutions for n=4 ..0..1..0..1....0..1..0..1....0..1..1..0....0..0..0..1....0..0..0..1 ..1..0..1..1....1..1..0..1....0..0..1..0....1..0..1..1....1..0..0..0 ..0..0..0..1....0..1..1..0....0..0..1..1....0..0..1..0....1..1..1..1 ..0..1..0..1....0..0..1..1....1..0..0..0....0..1..0..0....1..0..1..1 CROSSREFS Sequence in context: A303471 A301998 A105094 * A242355 A305519 A316956 Adjacent sequences:  A208708 A208709 A208710 * A208712 A208713 A208714 KEYWORD nonn AUTHOR R. H. Hardin Mar 01 2012 STATUS approved

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Last modified April 9 07:30 EDT 2020. Contains 333344 sequences. (Running on oeis4.)