a(n) = Sum_{k=0..n} binomial(4*n,4*k).
A070775
a(n) = Sum_{k=0..n} binomial(4*n,4*k).
Terms
- a(0) =1a(1) =2a(2) =72a(3) =992a(4) =16512a(5) =261632a(6) =4196352a(7) =67100672a(8) =1073774592a(9) =17179738112a(10) =274878431232
External references
- oeis: A070775