a(n) = Max { k>0 : denominator(S(k,2n+1)) } where S(k,s)=sum(i=1,k,i^s*H(i,2)) - H(k,2)*H(k,-s) and H(k,r)=sum(i=1,k,1/i^r) are the generalized harmonic numbers.

A096442

a(n) = Max { k>0 : denominator(S(k,2n+1)) } where S(k,s)=sum(i=1,k,i^s*H(i,2)) - H(k,2)*H(k,-s) and H(k,r)=sum(i=1,k,1/i^r) are the generalized harmonic numbers.

Terms

    a(0) =4a(1) =12a(2) =12a(3) =20a(4) =12a(5) =420a(6) =4a(7) =60a(8) =84a(9) =220a(10) =12a(11) =1092a(12) =4a(13) =60a(14) =924a(15) =340a(16) =12a(17) =103740a(18) =4a(19) =660a(20) =84a(21) =92a(22) =12a(23) =13260a(24) =44a(25) =60a(26) =1596a(27) =580a(28) =12a(29) =1861860

External references