a(n) = Sum_{k=0..floor(n/3)} binomial(5*n-3*k-1,n-3*k).
A371772
a(n) = Sum_{k=0..floor(n/3)} binomial(5*n-3*k-1,n-3*k).
Terms
- a(0) =1a(1) =4a(2) =36a(3) =365a(4) =3892a(5) =42714a(6) =477621a(7) =5411109a(8) =61901268a(9) =713435333a(10) =8271470666a(11) =96361329024
External references
- oeis: A371772