a(n) = A184879(2*n, n) - A184879(2*n, n+1) where A184879(n, k) = Hypergeometric2F1(-2*k, 2*k-2*n, 1, -1) if 0<=k<=n.

A184881

a(n) = A184879(2*n, n) - A184879(2*n, n+1) where A184879(n, k) = Hypergeometric2F1(-2*k, 2*k-2*n, 1, -1) if 0<=k<=n.

Terms

    a(0) =1a(1) =-3a(2) =2a(3) =-3a(4) =6a(5) =-14a(6) =36a(7) =-99a(8) =286a(9) =-858a(10) =2652a(11) =-8398a(12) =27132a(13) =-89148a(14) =297160a(15) =-1002915a(16) =3421710a(17) =-11785890a(18) =40940460a(19) =-143291610a(20) =504932340a(21) =-1790214660a(22) =6382504440a(23) =-22870640910a(24) =82334307276a(25) =-297670187844

External references