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 A209101 Number of 2Xn 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors 1
 2, 11, 76, 520, 3552, 24256, 165632, 1131008, 7723008, 52736000, 360103936, 2458943488, 16790716416, 114654183424, 782907736064, 5346028421120, 36504965480448, 249271496474624, 1702132247953408, 11622886011830272 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 2 of A209100 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 8*a(n-1) -8*a(n-2) for n>3 EXAMPLE Some solutions for n=4 ..0..0..1..2....0..0..1..1....0..0..0..1....0..0..1..1....0..0..0..0 ..1..2..0..0....2..0..0..1....2..1..0..2....1..0..2..0....1..1..2..0 CROSSREFS Sequence in context: A220878 A049363 A055085 * A118802 A053481 A110329 Adjacent sequences:  A209098 A209099 A209100 * A209102 A209103 A209104 KEYWORD nonn AUTHOR R. H. Hardin Mar 05 2012 STATUS approved

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