10644519600domain: NAppears in sequencesDenominators of first derivatives of Catalan numbers (as continuous functions of n).at n=32A260631Let v = list of denominators of Farey series of order n (see A006843); let b(n) = Sum 1/(k*k'*(k+k')), where (k,k') are pairs of successive terms of v; a(n) = denominator of b(n).at n=17A278048