66584

Appears in sequences

• Expansion of theta series of {E_7}* lattice in powers of q^(1/2).at n=48A003781
• Expansion of theta series of E_7 lattice in powers of q^2.at n=12A004008
• Nonzero coefficients in theta series of {E_7}* lattice.at n=24A030443
• a(n) = a(n-1) * a(n-2) - 1.at n=7A055937
• Numbers k such that (k, phi(k), sigma(k)) lies on a sphere with integral radius centered at the origin, i.e., k^2 + phi(k)^2 + sigma(k)^2 is a square.at n=6A066785
• Number T(n,k) of multisets of nonempty words with a total of n letters over k-ary alphabet such that all k letters occur at least once in the multiset; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=32A257740
• Number of multisets of nonempty words with a total of n letters over quaternary alphabet such that all letters occur at least once in the multiset.at n=3A320214
• a(n) is the number of squares of side length greater than 1 having vertices at the points of an n X n grid of dots.at n=29A328152