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 A208710 Number of 3Xn 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
 4, 32, 196, 1268, 8128, 52184, 334948, 2149988, 13800400, 88582472, 568596052, 3649722932, 23426960800, 150373741496, 965223885508, 6195610615940, 39768587869168, 255267911291816, 1638522010126516, 10517398618896212 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 3 of A208709 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 5*a(n-1) +9*a(n-2) +a(n-3) -2*a(n-4) EXAMPLE Some solutions for n=4 ..0..0..0..1....0..0..1..0....0..1..0..1....0..1..1..0....0..0..1..0 ..0..1..0..1....0..0..1..1....0..1..0..0....1..0..0..1....1..1..1..0 ..1..0..0..1....1..0..0..0....0..1..1..0....1..0..1..1....0..1..0..0 CROSSREFS Sequence in context: A270178 A018215 A099133 * A043018 A270015 A271161 Adjacent sequences:  A208707 A208708 A208709 * A208711 A208712 A208713 KEYWORD nonn AUTHOR R. H. Hardin Mar 01 2012 STATUS approved

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