a(n) = Sum_{k=0..n} 3^k * binomial(n,k) * binomial(n+2,k).
A388202
a(n) = Sum_{k=0..n} 3^k * binomial(n,k) * binomial(n+2,k).
Terms
- a(0) =1a(1) =10a(2) =79a(3) =586a(4) =4258a(5) =30724a(6) =221275a(7) =1593946a(8) =11494222a(9) =83004076a(10) =600312502a(11) =4348191940a(12) =31540317508a(13) =229093439176
External references
- oeis: A388202