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 A193884 G.f.: (1-x^2)/(1-x+x^4) 2
 1, 1, 0, 0, -1, -2, -2, -2, -1, 1, 3, 5, 6, 5, 2, -3, -9, -14, -16, -13, -4, 10, 26, 39, 43, 33, 7, -32, -75, -108, -115, -83, -8, 100, 215, 298, 306, 206, -9, -307, -613, -819, -810, -503, 110, 929, 1739, 2242, 2132, 1203, -536, -2778, -4910, -6113, -5577 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,6 COMMENTS The Kn11 sums, see A180662, of triangle A108299 equal the terms of this sequence. LINKS Index entries for linear recurrences with constant coefficients, signature (1,0,0,-1). FORMULA G.f.: (1+x)*(1-x)/(1-x+x^4) a(n) = a(n-1)-a(n-4), a(0) = a(1) = 1, a(2) = a(3) = 0. a(n) = A099530(n) - A099530(n-2) MAPLE A193884 := proc(n) option remember: if n=0 then 1 elif n=1 then 1 elif n=2 then 0 elif n=3 then 0 elif n>=4 then procname(n-1)-procname(n-4) fi: end: seq(A193884(n), n=0..54); CROSSREFS Sequence in context: A101677 A152067 A286756 * A128084 A131823 A089722 Adjacent sequences:  A193881 A193882 A193883 * A193885 A193886 A193887 KEYWORD sign,easy AUTHOR Johannes W. Meijer, Aug 11 2011 STATUS approved

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Last modified March 23 10:55 EDT 2019. Contains 321424 sequences. (Running on oeis4.)