a(n) is the numerator of the coefficient c_(2n+1) in the expansion Sum_{k=1..j} 1/(k*(k+1)/2)^2 = Sum_{m>=0} c_m/j^m for large values of j.

A340277

a(n) is the numerator of the coefficient c_(2n+1) in the expansion Sum_{k=1..j} 1/(k*(k+1)/2)^2 = Sum_{m>=0} c_m/j^m for large values of j.

Terms

    a(0) =0a(1) =-4a(2) =-116a(3) =-340a(4) =-356a(5) =-1076a(6) =-51836a(7) =-172a(8) =188a(9) =-201004a(10) =686564a(11) =-3423572a(12) =945336244a(13) =-34212700a(14) =94997798876

External references