a(n) = Sum_{k=0..n} (-3)^(n-k) * binomial(4*n,k).
A386701
a(n) = Sum_{k=0..n} (-3)^(n-k) * binomial(4*n,k).
Terms
- a(0) =1a(1) =1a(2) =13a(3) =103a(4) =869a(5) =7476a(6) =65323a(7) =577242a(8) =5144949a(9) =46167196a(10) =416527828a(11) =3774785983a(12) =34336862435a(13) =313330665532
External references
- oeis: A386701