a(n) = Sum_{k=0..n} 3^k * binomial(n,k) * binomial(n+1,k).
A388047
a(n) = Sum_{k=0..n} 3^k * binomial(n,k) * binomial(n+1,k).
Terms
- a(0) =1a(1) =7a(2) =46a(3) =307a(4) =2086a(5) =14374a(6) =100108a(7) =702979a(8) =4968838a(9) =35307442a(10) =251984932a(11) =1804984174a(12) =12969532252a(13) =93441190444a(14) =674781817816
External references
- oeis: A388047