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 A287655 Seven steps forward, six steps back. 4
 0, 1, 2, 3, 4, 5, 6, 7, 6, 5, 4, 3, 2, 1, 2, 3, 4, 5, 6, 7, 8, 7, 6, 5, 4, 3, 2, 3, 4, 5, 6, 7, 8, 9, 8, 7, 6, 5, 4, 3, 4, 5, 6, 7, 8, 9, 10, 9, 8, 7, 6, 5, 4, 5, 6, 7, 8, 9, 10, 11, 10, 9, 8, 7, 6, 5, 6, 7, 8, 9, 10, 11, 12, 11, 10, 9, 8, 7, 6, 7, 8, 9, 10 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Index entries for linear recurrences with constant coefficients, signature (1,0,0,0,0,0,0,0,0,0,0,0,1,-1). FORMULA a(n) = a(n-1) + a(n-13) - a(n-14) for n > 13. a(n) = Sum_{i=1..n} (-1)^floor((2*i-2)/13). MAPLE A287655:=n->add((-1)^floor((2*i-2)/13), i=1..n): seq(A287655(n), n=0..200); MATHEMATICA Table[Sum[(-1)^Floor[(2 i - 2)/13], {i, n}], {n, 0, 100}] CROSSREFS Cf. A008611 (one step back, two steps forward). Cf. A058207 (three steps forward, two steps back). Cf. A260644 (four steps forward, three steps back). Cf. A271800 (five steps forward, four steps back). Cf. A271859 (six steps forward, five steps back). Sequence in context: A063265 A211011 A232242 * A073794 A017892 A017882 Adjacent sequences:  A287652 A287653 A287654 * A287656 A287657 A287658 KEYWORD nonn,easy AUTHOR Wesley Ivan Hurt, May 29 2017 STATUS approved

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Last modified September 22 06:01 EDT 2021. Contains 347605 sequences. (Running on oeis4.)