126504

Appears in sequences

• a(0) = a(1) = 1; thereafter a(n) = sigma(a(n-1)) + sigma(a(n-2)).at n=14A000458
• Theta series of the coset of the E_7 lattice in its dual.at n=16A005931
• Nonzero coefficients in theta series of {E_7}* lattice.at n=33A030443
• A triangle sequence of polynomial coefficients:p(x,n)=Sum[Binomial[n, k]*(-x)^k*Sum[StirlingS2[n, m]*x^m, {m, 0, n - k}], {k, 0, n}].at n=53A174859
• Number of tilings of an n X 1 rectangle (using tiles of dimension 1 X 1 and 2 X 1) that are not the concatenation of smaller equally-sized tilings.at n=27A224918