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 A006021 The game of contours. (Formerly M0409) 0
 0, 1, 2, 3, 1, 4, 3, 2, 0, 5, 2, 3, 1, 4, 3, 2, 0, 5, 2, 3, 1, 4, 3, 2, 0, 5, 2, 3, 1, 4, 3, 2, 0, 5, 2, 3, 1, 4, 3, 2, 0, 5, 2, 3, 1, 4, 3, 2, 0, 5, 2, 3, 1, 4, 3, 2, 0, 5, 2, 3, 1, 4, 3, 2, 0, 5, 2, 3, 1, 4, 3, 2, 0, 5, 2, 3, 1, 4, 3, 2, 0, 5, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 REFERENCES E. R. Berlekamp, J. H. Conway and R. K. Guy, Winning Ways, Academic Press, NY, 2 vols., 1982, see p. 553. N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS FORMULA a(0) = 0, b(1) = 0, a(n) = mex({a(s) ^ b(t): s+t = n-1 and s>0} union {b(s) + b(t): s+t = n-1}), b(n) = mex({a(s) ^ b(t): s+t = n-1 and s>0}) with ^ denoting bitwise addition. - Sean A. Irvine, Dec 14 2016 a(n+8) = a(n) for n >= 6. - Sean A. Irvine, Dec 14 2016 CROSSREFS Sequence in context: A011857 A242360 A299927 * A002186 A125936 A243614 Adjacent sequences:  A006018 A006019 A006020 * A006022 A006023 A006024 KEYWORD nonn AUTHOR EXTENSIONS More terms from Sean A. Irvine, Dec 14 2016 STATUS approved

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Last modified October 14 16:48 EDT 2019. Contains 328022 sequences. (Running on oeis4.)