a(n) = Sum_{k=0..n} 4^k * binomial(n,k) * binomial(n+3,k).
A388206
a(n) = Sum_{k=0..n} 4^k * binomial(n,k) * binomial(n+3,k).
Terms
- a(0) =1a(1) =17a(2) =201a(3) =2073a(4) =20049a(5) =187425a(6) =1718425a(7) =15572009a(8) =140075937a(9) =1254065201a(10) =11192366953a(11) =99684240441a(12) =886620991473
External references
- oeis: A388206