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 A258728 Number of length n+6 0..3 arrays with at most one downstep in every 6 consecutive neighbor pairs 1
 2592, 5664, 13720, 35704, 92548, 228081, 526672, 1183616, 2727288, 6597449, 16454876, 40863000, 98379104, 230053160, 534172704, 1260245516, 3043544240, 7443617220, 18093595536, 43272115712, 102190186552, 241107878575 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 6 of A258730 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 4*a(n-1) -6*a(n-2) +4*a(n-3) -a(n-4) +80*a(n-6) -204*a(n-7) +177*a(n-8) -52*a(n-9) -125*a(n-12) +184*a(n-13) -68*a(n-14) +10*a(n-18) -4*a(n-19) EXAMPLE Some solutions for n=4 ..0....3....0....3....3....1....0....2....0....0....1....0....0....3....3....1 ..3....3....0....3....3....2....1....0....3....2....1....2....2....3....1....2 ..0....0....2....0....1....3....0....1....3....0....0....2....0....1....1....0 ..0....2....3....0....1....3....0....2....3....0....0....2....0....1....2....1 ..0....2....0....0....2....1....1....3....3....1....0....2....1....1....3....2 ..0....2....0....1....2....1....2....3....3....1....3....1....2....1....3....2 ..1....3....0....2....2....1....2....3....3....1....3....1....2....1....3....3 ..3....3....2....2....3....1....3....3....0....1....3....1....3....1....0....3 ..2....3....3....0....1....2....2....1....1....2....0....1....3....3....1....0 ..2....3....3....1....3....3....3....3....2....2....1....1....0....1....1....2 CROSSREFS Cf. A258730 Sequence in context: A252152 A035894 A179702 * A156322 A096298 A204782 Adjacent sequences:  A258725 A258726 A258727 * A258729 A258730 A258731 KEYWORD nonn AUTHOR R. H. Hardin, Jun 08 2015 STATUS approved

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Last modified December 15 20:00 EST 2019. Contains 330000 sequences. (Running on oeis4.)