a(n) = Sum_{k=0..n} binomial(n, k) * binomial(n - 1, n - k - 1) * (-n)^k.
A367257
a(n) = Sum_{k=0..n} binomial(n, k) * binomial(n - 1, n - k - 1) * (-n)^k.
Terms
- a(0) =1a(1) =1a(2) =-3a(3) =10a(4) =-15a(5) =-474a(6) =12565a(7) =-258572a(8) =5136705a(9) =-102255290a(10) =2019481101a(11) =-37521627252a(12) =543274535089
External references
- oeis: A367257