689664

Appears in sequences

• Number of bicolored maps defined by immersions of unoriented circle into oriented sphere with n double points with edges labeled 1..2*n such that labels of successive edges along the curve (starting at any edge, going in the direction determined by the coloring) are encountered in pairs of the form {2*m-1, 2*m} (in either order).at n=4A268560
• Expansion of e.g.f. Product_{k>=1} ((1 + x^k)/(1 - x^k))^(1/k).at n=8A295792