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 A198405 Number of 2nX2 0..4 arrays with values 0..4 introduced in row major order and each element equal to exactly one horizontal and vertical neighbor 2
 2, 17, 377, 11473, 375273, 12456897, 414711897, 13814539697, 460231956937, 15333001667233, 510833776539193, 17018936996199057, 567002973887727017, 18890274083549781377, 629348476275500726297, 20967377362990867086193 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 1 of A198408 LINKS R. H. Hardin, Table of n, a(n) for n = 1..200 FORMULA Empirical: a(n) = 51*a(n-1) -691*a(n-2) +3601*a(n-3) -7056*a(n-4) +4096*a(n-5) EXAMPLE Some solutions for n=3 ..0..0....0..0....0..1....0..0....0..0....0..0....0..0....0..1....0..0....0..1 ..1..2....1..2....0..1....1..1....1..1....1..2....1..1....0..1....1..1....0..1 ..1..2....1..2....2..3....2..3....2..3....1..2....2..2....2..2....0..0....2..3 ..3..3....0..0....2..3....2..3....2..3....2..0....3..3....0..0....2..2....2..3 ..4..0....3..2....1..0....3..0....4..4....2..0....4..4....1..3....0..0....4..4 ..4..0....3..2....1..0....3..0....2..2....1..1....2..2....1..3....1..1....3..3 CROSSREFS Sequence in context: A201785 A204249 A128159 * A202972 A085617 A152557 Adjacent sequences:  A198402 A198403 A198404 * A198406 A198407 A198408 KEYWORD nonn AUTHOR R. H. Hardin Oct 24 2011 STATUS approved

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