a(n) = 27^n * Sum_{k=0..n} (-1)^k*binomial(-1/3, k)^2.
A367330
a(n) = 27^n * Sum_{k=0..n} (-1)^k*binomial(-1/3, k)^2.
Terms
- a(0) =1a(1) =24a(2) =684a(3) =17880a(4) =493785a(5) =13108608a(6) =358702272a(7) =9579537792a(8) =261039317220
External references
- oeis: A367330