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 A218065 Number of 2 X n arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random 0..1 2 X n array. 1
 4, 6, 18, 42, 108, 268, 676, 1694, 4258, 10690, 26852, 67436, 169372, 425382, 1068370, 2683258, 6739132, 16925644, 42509556, 106764750, 268144706, 673458066, 1691421684, 4248085292, 10669266476, 26796365718, 67300335730, 169027965834 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 2 of A218064. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = a(n-1) + 4*a(n-2) + a(n-3) - 3*a(n-4) - 2*a(n-5). Empirical g.f.: 2*x*(2 + x - 2*x^2 - 2*x^3) / ((1 - x)*(1 + x)*(1 - x - 3*x^2 - 2*x^3)). - Colin Barker, Jul 23 2018 EXAMPLE Some solutions for n=3: ..1..1..1....0..0..0....0..0..0....1..0..0....1..0..0....1..0..0....0..0..0 ..1..1..1....0..0..1....0..1..1....0..0..1....1..0..0....1..0..1....0..0..0 CROSSREFS Cf. A218064. Sequence in context: A064403 A235344 A060667 * A005959 A057393 A196570 Adjacent sequences:  A218062 A218063 A218064 * A218066 A218067 A218068 KEYWORD nonn AUTHOR R. H. Hardin, Oct 19 2012 STATUS approved

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Last modified May 22 04:38 EDT 2022. Contains 353933 sequences. (Running on oeis4.)