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%I #15 Apr 22 2021 16:25:35
%S 2,-2,1,-1,-1,1,1,-1,-1,1,5,-5,-691,691,7,-7,-3617,3617,43867,-43867,
%T -174611,174611,854513,-854513,-236364091,236364091,8553103,-8553103,
%U -23749461029,23749461029,8615841276005,-8615841276005,-7709321041217,7709321041217,2577687858367,-2577687858367
%N Numerators of sum (C(n) = A051716/A051717) + (1 followed by first differences A172083/A051717 of Bernoulli numbers).
%C Denominators: 1, 1, 3, 3, 15, 15, 21, 21, 15, 15, 33, 33, 1365, 1365, ... = A001897 with terms repeated. See A000367/A002445.
%Y Cf. A000367, A001897, A002445, A027641, A051716, A051717
%K sign,frac
%O 0,1
%A _Paul Curtz_, Jan 25 2010
%E Name edited by _Michel Marcus_, Jan 30 2021
%E Clarified definition, added more terms. - _N. J. A. Sloane_, Apr 22 2021