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 A172086 Numerators of sum (C(n) = A051716/A051717) + (1 followed by first differences A172083/A051717 of Bernoulli numbers). 1
 2, -2, 1, -1, -1, 1, 1, -1, -1, 1, 5, -5, -691, 691, 7, -7, -3617, 3617, 43867, -43867, -174611, 174611, 854513, -854513, -236364091, 236364091, 8553103, -8553103, -23749461029, 23749461029, 8615841276005, -8615841276005, -7709321041217, 7709321041217, 2577687858367, -2577687858367 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Denominators: 1, 1, 3, 3, 15, 15, 21, 21, 15, 15, 33, 33, 1365, 1365, ... = A001897 with terms repeated. See A000367/A002445. LINKS Table of n, a(n) for n=0..35. CROSSREFS Cf. A000367, A001897, A002445, A027641, A051716, A051717 Sequence in context: A083888 A102681 A274013 * A339047 A347735 A204014 Adjacent sequences: A172083 A172084 A172085 * A172087 A172088 A172089 KEYWORD sign,frac AUTHOR Paul Curtz, Jan 25 2010 EXTENSIONS Name edited by Michel Marcus, Jan 30 2021 Clarified definition, added more terms. - N. J. A. Sloane, Apr 22 2021 STATUS approved

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Last modified September 18 11:53 EDT 2024. Contains 376000 sequences. (Running on oeis4.)