a(n) = denominator( (-1)^(n-1)*H(2*n)/(2*n + 1) ), where H(n) is the n-th harmonic number.

A392690

a(n) = denominator( (-1)^(n-1)*H(2*n)/(2*n + 1) ), where H(n) is the n-th harmonic number.

Terms

    a(0) =1a(1) =2a(2) =12a(3) =20a(4) =2520a(5) =2520a(6) =27720a(7) =5405400a(8) =720720a(9) =4084080a(10) =325909584a(11) =5173168a(12) =1784742960a(13) =240940299600a(14) =80313433200

External references