25784

Appears in sequences

• Trajectory of 3 under map n->13n+1 if n odd, n->n/2 if n even.at n=34A037104
• T(n,n-2), array T as in A047140.at n=8A047144
• Least positive k such that k*n + 1 is a golden semiprime (A108540).at n=52A108200
• Number of lattice walks from (0,0) to (n,n) using steps S={(k,0),(0,k),(r,r)|0<k<=3,0<r<=2} which never go above the line y=x.at n=6A175936
• Number of Cayley graphs on n nodes.at n=27A185959
• Expansion of Product_{k>0} ((1-x^{5k-2}) * (1-x^{5k-3})/((1-x^{5k-1}) * (1-x^{5k-4})))^4 in powers of x.at n=37A285444
• Numbers whose sum of prime factors is equal to their product of prime indices.at n=40A331384
• a(n) = a(n-1) + 6*a(n-3) + 2*a(n-4), with a(0) = a(1) = 1, a(2) = 3, a(3) = 6.at n=13A339600
• Number of edges in a complete bipartite graph where the n vertices of each part are placed on the vertices, and on opposite sides, of a regular 2n-gon.at n=15A392973