21318

Appears in sequences

• Fermat coefficients.at n=7A000973
• a(n) = binomial(3*n+1,n)/(n+1).at n=7A006013
• a(n) = floor(binomial(n,7)/8).at n=22A011844
• Expansion of (1-4*x)^(11/2).at n=16A020923
• Expansion of (1-4*x)^(19/2).at n=16A020931
• Irreducible Euler sums of weight 8 and depth 10+2n.at n=14A031164
• Number of necklaces with 8 black beads and n-8 white beads.at n=15A032193
• Duplicate of A006013.at n=7A046648
• Triangle of rooted planar maps, read by rows.at n=35A046652
• If n = 2*m then a(n) = binomial(3*m, m)/(2*m+1), if n=2*m+1 then a(n) = binomial(3*m+1, m+1)/(2*m+1).at n=15A047749
• Number of dissectable polyhedra with n tetrahedral cells and symmetry of type I.at n=60A047753
• Duplicate of A047767.at n=15A047756
• Number of dissectable polyhedra with n tetrahedral cells and symmetry of type P.at n=29A047765
• a(n) = A047765(2n).at n=14A047767
• Number of dissectable polyhedra with n tetrahedral cells and symmetry of type D.at n=45A047773
• T(2n+7,n), array T as in A051168; a count of Lyndon words.at n=8A050185
• a(n) = n*(n+1)*(n+2)*(n^2+7*n+32)/120.at n=16A051747
• a(n) = ceiling(binomial(n,8)/n).at n=22A053731
• A sequence related to numeric partitions and Fermat Coefficients.at n=15A059251
• Split positive integers into extending even groups and sum: 1+2, 3+4+5+6, 7+8+9+10+11+12, 13+14+15+16+17+18+19+20, ...at n=22A061317