a(n) = Sum_{k=0..n} (-1)^k*C(n, k)^2*C(2*k, k), where C(n, k) denotes the binomial coefficient n!/(k!*(n-k)!).
A244973
a(n) = Sum_{k=0..n} (-1)^k*C(n, k)^2*C(2*k, k), where C(n, k) denotes the binomial coefficient n!/(k!*(n-k)!).
Terms
- a(0) =1a(1) =-1a(2) =-1a(3) =17a(4) =-65a(5) =49a(6) =881a(7) =-5489a(8) =12223a(9) =42785a(10) =-479951a(11) =1746271a(12) =440881a(13) =-39651457a(14) =212039855a(15) =-326783183a(16) =-2817155137a(17) =23175692033a(18) =-68726927071a(19) =-128775914225
External references
- oeis: A244973