33695573875domain: NAppears in sequencesNumerator of the product of the n-th triangular number and the n-th harmonic number.at n=23A119786Numerator of absolute value of Sum_{k=1..n} (-1)^(k+1)*(2*k+1)*(Sum_{i=1..k} 1/i).at n=23A120284Denominator of H(n)/H(n-1), where H(n) is the n-th harmonic number = Sum_{k=1..n} 1/k.at n=23A193758