843756

Appears in sequences

• Expansion of the g.f. x/((1+2x)(1-x-x^2)).at n=21A084179
• Number of walks of length 2n between two nodes at distance 2 in the cycle graph C_10.at n=10A095930
• a(n) = Sum_{k >= 0} binomial(n,5*k).at n=22A139398
• a(n) = Sum_{k>=0} binomial(n,5*k+2).at n=22A139714
• a(n) = Sum_{k=0..n} binomial(5*n+2,5*k).at n=4A345456
• a(n) = Sum_{k=0..n} binomial(2*n,5*k).at n=11A387844
• a(n) = Sum_{k=0..n} binomial(3*n+1,5*k).at n=7A387872
• a(n) = Sum_{k=0..n} binomial(4*n+2,5*k).at n=5A387905