285384

Appears in sequences

• Fermat coefficients.at n=21A000971
• Maximally extended polygons of length 2n on cubic lattice.at n=5A006783
• Number of 8-ary trees with n vertices.at n=6A007556
• Molien series for 3-D group X1.at n=43A037240
• a(n) = binomial((n+1)^2, n) / (n+1)^2.at n=6A143669
• Number of compositions of n in which the maximal multiplicity of parts equals 7.at n=15A243124
• a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/7)} a(7*k) * a(n-1-7*k).at n=42A386396