a(n) = Sum_{k=0..n} 2^k * 3^(n-k) * binomial(4*n+1,k) * binomial(4*n-k,n-k).
A385671
a(n) = Sum_{k=0..n} 2^k * 3^(n-k) * binomial(4*n+1,k) * binomial(4*n-k,n-k).
Terms
- a(0) =1a(1) =22a(2) =774a(3) =30458a(4) =1260886a(5) =53731512a(6) =2333065354a(7) =102643195068
External references
- oeis: A385671