a(n) = Sum_{k=0..n} 3^k * 2^(n-k) * binomial(4*n+1,k) * binomial(4*n-k,n-k).
A386831
a(n) = Sum_{k=0..n} 3^k * 2^(n-k) * binomial(4*n+1,k) * binomial(4*n-k,n-k).
Terms
- a(0) =1a(1) =23a(2) =814a(3) =32102a(4) =1330436a(5) =56734023a(6) =2464566064a(7) =108464237352
External references
- oeis: A386831