a(n) is the denominator of the n-th hyperharmonic number of order n.

Terms

a(0) =1a(1) =2a(2) =6a(3) =12a(4) =20a(5) =60a(6) =210a(7) =56a(8) =504a(9) =504a(10) =660a(11) =3960a(12) =5148a(13) =4004a(14) =4290a(15) =34320a(16) =17680a(17) =31824a(18) =302328a(19) =77520a(20) =813960a(21) =8953560a(22) =2288132a(23) =27457584a(24) =49031400a(25) =12498200a(26) =168725700a(27) =42948360a(28) =10925460a(29) =163881900