a(n) = Sum_{k=0..n} binomial(n,k) * binomial(n+4*k,k).
A388535
a(n) = Sum_{k=0..n} binomial(n,k) * binomial(n+4*k,k).
Terms
- a(0) =1a(1) =6a(2) =58a(3) =642a(4) =7514a(5) =90681a(6) =1115926a(7) =13919940a(8) =175374298a(9) =2226443808a(10) =28436903193a(11) =364990705338
External references
- oeis: A388535