a(n) = Sum_{k = 0..n} binomial(n,k)^4.
A005260
a(n) = Sum_{k = 0..n} binomial(n,k)^4.
Terms
- a(0) =1a(1) =2a(2) =18a(3) =164a(4) =1810a(5) =21252a(6) =263844a(7) =3395016a(8) =44916498a(9) =607041380a(10) =8345319268a(11) =116335834056
External references
- oeis: A005260