219318

Appears in sequences

• Expansion of (1+3*x+9*x^2+12*x^3+11*x^4+3*x^5+x^6)/((1-x)^2*(1-x^2)^2*(1-x^3)).at n=34A055383
• Initial seeds x which will enter a cycle of length 4 under the iteration of x -> A063919(x), the sum of proper unitary divisors.at n=18A098187
• G.f. A(x) satisfies A(x) = 1 + x/A(x) * (1 + A(x)^5).at n=7A371341