23425

Appears in sequences

• a(n) = n*(3*n^2 - 1)/2.at n=25A004188
• Numbers k such that the continued fraction for sqrt(k) has period 89.at n=25A020428
• a(n) = Sum_{k=1..n} floor((n/k) * floor((n/k) * floor(n/k))).at n=26A024922
• Numbers k that can be expressed as k = w+x = y*z with w*x = (y+z)^2 where w, x, y, and z are all positive integers.at n=24A057369
• Expansion of (1-4*x)/(1-x*(1-x)^3).at n=20A119306
• Truncated octahedron with faces of centered polygons.at n=12A193228
• Number of -6..6 arrays of n elements with first through fourth differences also in -6..6.at n=4A202662
• T(n,k)=Number of -k..k arrays of n elements with first through fourth differences also in -k..k.at n=49A202664
• Number of -n..n arrays of 5 elements with first through fourth differences also in -n..n.at n=5A202665
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 163", based on the 5-celled von Neumann neighborhood.at n=32A270455
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 901", based on the 5-celled von Neumann neighborhood.at n=25A273744
• Number of n X 3 0..1 arrays with no element unequal to a strict majority of its king-move neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.at n=16A280228
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f.: exp(k*((1+x)^k - 1)).at n=39A294118
• a(n) = (3 + 2*n - 3*n^2 + 4*n^3 - 3*((-1 + n) mod 2))/6.at n=32A304487
• a(n) is the number of integer triples (x,y,z) satisfying a system of linear inequalities and congruences specified in the comments.at n=36A370349
• a(n) is the number of vertices in the n-fold iterated barycentric subdivision of a triangle (or 2-simplex).at n=6A380996