79846

Appears in sequences

• a(n) = Sum_{k=0..n} C(n,floor(k/2))*(-4)^(n-k).at n=8A127363
• a(n)=sum{k=0..n, C(n,floor(k/2))*(-1)^k*4^(n-k)}.at n=8A133444
• Twice A137829.at n=20A201078