a(n) = Sum_{k=0..n} 3^k * binomial(n+1,k+1) * binomial(2*k+2,k+2).
A387309
a(n) = Sum_{k=0..n} 3^k * binomial(n+1,k+1) * binomial(2*k+2,k+2).
Terms
- a(0) =1a(1) =14a(2) =174a(3) =2128a(4) =26045a(5) =320082a(6) =3951493a(7) =48987848a(8) =609592347a(9) =7610525650a(10) =95287524332
External references
- oeis: A387309