a(n) = Sum_{k=0..n} (3*n-2*k)!/((n-k)!^3*k!)*(-2)^k.
A318109
a(n) = Sum_{k=0..n} (3*n-2*k)!/((n-k)!^3*k!)*(-2)^k.
Terms
- a(0) =1a(1) =4a(2) =46a(3) =652a(4) =10186a(5) =168304a(6) =2884456a(7) =50723824a(8) =909192538a(9) =16538659384a(10) =304391739796
External references
- oeis: A318109