142209

Appears in sequences

• Number of 2 X 2 matrices having all terms in {-n,...,0,...,n} and nonnegative determinant.at n=11A211147
• Expansion of Sum_{p prime, i>=1} x^(p^i)/(1 - x^(p^i)) / Product_{p prime, j>=1} (1 - x^(p^j)).at n=54A281616