364896

Appears in sequences

• Base 5 digital convolution sequence.at n=16A033642
• Theta series of lattice D3 tensor D3* (dimension 9, det. 262144, min. norm 6).at n=39A033694
• For 1<=x<=n, 1<=y<=n with gcd(x,y)=1, write 1 = gcd(x,y) = u*x+v*y with u,v minimal; a(n) = m^2*s, where s is the population variance of the values of u+v and m is the number of such values.at n=19A345725
• a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/5)} binomial(n,5*k+1) * a(n-5*k-1).at n=9A352430
• Triangle T(n,k) read by rows: the number of traceless symmetric binary n X n matrices with 2k one's and no all-1 2 X 2 submatrix.at n=54A352472