211099

Appears in sequences

• Expansion of 1/((1-x)(1-9x)(1-11x)(1-12x)).at n=4A025130
• a(n) = a(1) + a(2) + ... + a(n-1) + a(m) for n >= 4, where m = 2*n - 3 - 2^(p+1) and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1 and a(2) = a(3) = 3.at n=17A049972