24660

Appears in sequences

• Theta series of direct sum of 3 copies of hexagonal lattice.at n=37A008654
• Numbers k whose decimal representation, read as a base-12 value and divided by k, yields an integer.at n=17A032555
• Number of rooted trees with n nodes with every leaf at height 6.at n=20A048811
• Number of ways of placing n nonattacking (normal) queens on n X n board; solutions congruent on the torus count only once.at n=13A062164
• E.g.f. A(x) satisfies: L(x) = A(x)/(x*A'(x)) * L(A(x)) where L(x) = x + x*A(x).at n=6A179493
• Smallest number k such that prime(n) divides the n-th divisor of k.at n=31A226101
• The Wiener index of the zig-zag polyhex nanotube TUHC_6[2n,2] defined pictorially in Fig. 1 of the Eliasi et al. reference.at n=16A227703
• Number of maximal 2-independent sets in the 3-dimensional (2, 2, n) grid graph.at n=12A231884
• Expansion of 1/(2*f(x)) + 1/(4 - 2*g(x)), where f(x) = sqrt(1 - 4*x) and g(x) = sqrt(1 + 4*x).at n=9A268600
• First differences of A275315.at n=15A275066
• a(n) is the number of edges formed by n-secting the angles of a decagon.at n=25A335802
• Numbers k such that A003415(k) == A276085(k) (mod 2310), where A003415 is the arithmetic derivative and A276085 is the primorial base log-function.at n=25A391864