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 A229515 Number of n X 2 0..2 arrays of the median of the corresponding element, the element to the east and the element to the south in a larger (n+1) X 3 0..2 array without adjacent equal elements in the latter. 1
 7, 33, 129, 481, 1751, 6433, 23507, 86295, 316099, 1159635, 4251051, 15590219, 57163723, 209618487, 768636943, 2818506063, 10335115437, 37897559703, 138965833325, 509570185111, 1868532243761, 6851675250519, 25124255606589 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A229521. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 2*a(n-1) + 8*a(n-2) - 7*a(n-3) - 4*a(n-4) + 19*a(n-5) - 17*a(n-6) + 20*a(n-7) - 12*a(n-8) + 17*a(n-9) + 3*a(n-10) + 13*a(n-11) + 16*a(n-12) - 7*a(n-13) + 2*a(n-14) + 8*a(n-15) -1 3*a(n-16) + 9*a(n-17) - 10*a(n-18) - a(n-19) + a(n-20). EXAMPLE Some solutions for n=3: 2 0 1 0 2 1 1 2 1 0 1 0 1 1 1 1 1 1 0 1 0 2 1 1 1 0 1 1 1 2 0 1 1 1 2 0 0 2 1 0 2 0 1 2 0 1 0 1 2 0 1 2 1 1 1 2 2 0 0 2 CROSSREFS Cf. A229521. Sequence in context: A215054 A350643 A114014 * A320907 A258458 A320546 Adjacent sequences: A229512 A229513 A229514 * A229516 A229517 A229518 KEYWORD nonn AUTHOR R. H. Hardin, Sep 25 2013 STATUS approved

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Last modified March 31 05:21 EDT 2023. Contains 361634 sequences. (Running on oeis4.)