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 A222868 Number of n X 2 0..5 arrays with no element equal to another at a city block distance of exactly two, and new values 0..5 introduced in row major order. 1
 2, 7, 34, 370, 5314, 82690, 1313794, 20983810, 335593474, 5368905730, 85900132354, 1374392680450, 21990245138434, 351843771219970, 5629499735539714, 90071993352716290, 1441151883979784194, 23058430105021841410 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A222871. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 21*a(n-1) - 84*a(n-2) + 64*a(n-3) for n>5. Empirical g.f.: x*(2 - 35*x + 55*x^2 + 116*x^3 - 48*x^4) / ((1 - x)*(1 - 4*x)*(1 - 16*x)). - Colin Barker, Aug 16 2018 EXAMPLE Some solutions for n=3: ..0..0....0..1....0..0....0..0....0..1....0..1....0..1....0..1....0..1....0..1 ..1..2....2..2....1..2....1..2....2..3....0..2....0..2....2..1....2..3....2..3 ..1..3....1..3....3..4....1..2....1..0....3..4....3..3....3..3....4..5....4..4 CROSSREFS Cf. A222871. Sequence in context: A110313 A000944 A136310 * A222777 A222891 A342411 Adjacent sequences: A222865 A222866 A222867 * A222869 A222870 A222871 KEYWORD nonn AUTHOR R. H. Hardin, Mar 07 2013 STATUS approved

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Last modified March 2 21:56 EST 2024. Contains 370498 sequences. (Running on oeis4.)