a(n) = (1/1 - 1/(n-1) + ... + d/binomial(n-[ n/2 ],[ n/2 ]))*L, where L = LCM{1, n-1, ..., binomial(n-[ n/2 ],[ n/2 ])}, d = (-1)^n.

A025580

a(n) = (1/1 - 1/(n-1) + ... + d/binomial(n-[ n/2 ],[ n/2 ]))*L, where L = LCM{1, n-1, ..., binomial(n-[ n/2 ],[ n/2 ])}, d = (-1)^n.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =5a(4) =13a(5) =-1a(6) =41a(7) =383a(8) =901a(9) =-47a(10) =1945a(11) =26141a(12) =29368a(13) =-6359a(14) =296509a(15) =345525a(16) =756291a(17) =-197211a(18) =10483329a(19) =225371001a(20) =242537898a(21) =-3394965a(22) =204481239a(23) =5215763433

External references