a(n) = Sum_{k=0..n} binomial(n+4*k,k).
A390384
a(n) = Sum_{k=0..n} binomial(n+4*k,k).
Terms
- a(0) =1a(1) =6a(2) =52a(3) =518a(4) =5480a(5) =59883a(6) =667788a(7) =7551472a(8) =86268736a(9) =993247305a(10) =11506149009a(11) =133956128894
External references
- oeis: A390384