215602

Appears in sequences

• Number of unrooted planar 2-constellations with n digons. Also number of n-edge unrooted planar Eulerian maps with bicolored faces.at n=9A090371
• a(1) = 50 and for any n > 0, a(n+1)^2 is the smallest square that begins with a(n).at n=39A309123
• Number of dessins d'enfants D(n,g) with n edges of genus g, read by rows.at n=25A380453