a(n) = Sum_{k=0..n} (-1)^k * binomial(-n,k) * binomial(2*k,n-k).
A362087
a(n) = Sum_{k=0..n} (-1)^k * binomial(-n,k) * binomial(2*k,n-k).
Terms
- a(0) =1a(1) =1a(2) =7a(3) =37a(4) =215a(5) =1271a(6) =7651a(7) =46614a(8) =286599a(9) =1774630a(10) =11050897a(11) =69134572a(12) =434174819a(13) =2735565574a(14) =17283825370a(15) =109466361512a(16) =694764983463
External references
- oeis: A362087