389555

Appears in sequences

• 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), with a(1) = a(2) = 1 and a(3) = 4.at n=18A049944
• Expansion of (1/x) * Series_Reversion( x / ((1+x) * (1+x^2)^2) ).at n=11A369440