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 A106822 Triangle read by rows: g.f. for row n is Product( (x^i-x^(r+1))/(1-x^i), i = 1..r-2). 2
 1, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 2, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 2, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 3, 2, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 3, 3, 2, 2, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,12 REFERENCES See A008967 for references. LINKS EXAMPLE Initial rows are: [1] [1] [0, 1, 1, 1] [0, 0, 0, 1, 1, 2, 1, 1] [0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 2, 1, 1] [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 2, 2, 1, 1] MAPLE f2:=r->mul( (x^i-x^(r+1))/(1-x^i), i = 1..r-2); for r from 1 to 10 do series(f2(r), x, 50); od: CROSSREFS If the initial zeros in each row are omitted, we get A008967. Cf. A008967, A106823. Sequence in context: A053622 A016408 A316868 * A203905 A309142 A064532 Adjacent sequences:  A106819 A106820 A106821 * A106823 A106824 A106825 KEYWORD nonn,tabf AUTHOR N. J. A. Sloane, May 20 2005 STATUS approved

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Last modified October 18 12:18 EDT 2019. Contains 328160 sequences. (Running on oeis4.)