27297360

Appears in sequences

• a(n) = coefficient of x^n in the (2^(n-1))-th iteration of x+x^2 for n>=1.at n=5A158261
• Table where row n lists the coefficients in the (2^n)-th iteration of x+x^2 for n>=0, read by antidiagonals not including trailing zeros in rows.at n=47A158264