18264

Appears in sequences

• Number of inequivalent n-gons.at n=9A000939
• Number of functional digraphs (digraphs of functions on n nodes where every node has outdegree 1 and loops of length 1 are forbidden).at n=12A001373
• Number of partitions satisfying cn(1,5) + cn(4,5) <= cn(0,5) + cn(2,5) + cn(3,5).at n=39A039866
• Number of positive integers <= 2^n of form 7 x^2 + 7 y^2.at n=19A054186
• Bisection of A000939.at n=3A094155
• Row sums in A100781.at n=23A100784
• Number of permutations of 1..n containing the relative rank sequence { 256314 } at any spacing.at n=3A159167
• Riordan array (f(x), x*f(x)) where f(x) is the g.f. of A059738.at n=39A171505
• Numbers divisible by at least four of their digits, different and >1.at n=41A187238
• Number of (w,x,y,z) with all terms in {1,...,n} and w^2<x^2+y^2+z^2.at n=12A212092
• E.g.f.: arcsinh(x)/(1+LambertW(-x)).at n=6A277470
• a(n) is the total surface area of a hollow cubic block (defined as a block with a shell thickness of 1 cube) where n is the edge length of the removed volume.at n=37A309842
• Number of nX4 0..1 arrays with every element unequal to 0, 1 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=19A317769
• Welschinger invariant for the number of real plane curves of degree n passing through 3*n-1 general points.at n=4A319851
• Duplicate of A319851.at n=2A320605
• a(n) is the number of edges formed by n-secting the angles of an octagon.at n=29A335771