164736

Appears in sequences

• Number of rooted unicursal planar maps with n edges and no vertices of valency 1 (unicursal means that exactly two vertices are of odd valency; there is an Eulerian path).at n=7A069721
• A transform of binomial(n,5).at n=8A082139
• Number of pairs of orthogonal (-x,y) vectors of length 1*(x+y), where x/y is the n-th rational <= 1, ordered first by y and then x, e.g. 1/1, 1/2, 1/3, 2/3, 1/4, 3/4 ...at n=17A225986
• Number of pairs of orthogonal (-6,7) vectors of length 13*n.at n=0A226004
• a(n) = (2^floor(n+n/2)/sqrt(Pi)^mod(n+1,2))*Gamma(n+1/2)/Gamma(n/2+1).at n=7A264152
• Intersection of A046346 and (A046346-2).at n=13A309310
• a(n) = 24*(3*n + 1)!/(n!*((n + 2)!)^2).at n=5A368875
• Numbers k such that the sums of digits of k and 1/k in factorial base (A007623) are equal.at n=42A373084