30340

Appears in sequences

• Partial sums of floor(Fibonacci(n)/4).at n=24A179006
• a(n) = Sum_{k=1..n} k*k', where n' is the arithmetic derivative of n.at n=48A190117
• Number of n X 4 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 1 0 1 vertically.at n=37A208375
• Number of n-bit numbers in A077436.at n=24A211676
• Triangle T(n,k) read by rows: T(n,k) = number of permutations on 123...n with exactly two abc patterns and no aj pattern with j<=k, for n>=0, 0<=k<=n.at n=57A229158
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 918", based on the 5-celled von Neumann neighborhood.at n=39A273748
• Expansion of Product_{k>=1} (1 + 2*x^k - x^(2*k)).at n=46A293182
• Practical numbers z such that z^2 = x^2 + y^2 for some practical numbers x and y with gcd(x,y,z) = 4.at n=41A294112
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + n*b(n), where a(0) = 1, a(1) = 4, b(0) = 2, b(1) = 3, b(2) = 5, and (a(n)) and (b(n)) are increasing complementary sequences.at n=15A296295
• Numbers k for which rank of the elliptic curve y^2=x^3+k*x is 4.at n=27A309031
• Number of partitions of n into an odd number of parts that are not multiples of 4.at n=51A339407
• Total number of vertices in the graph (see A392172) formed when n points are placed in general position on each edge of a square and a chord is drawn from each point to the 3*n points on the other three sides.at n=8A392173
• Array read by antidiagonals: Place k points in general position on each side of a regular n-gon and join every pair of the k*n boundary points by a chord; T(n,k) (n >= 3, k >= 0) gives the number of vertices in the resulting planar graph.at n=46A392261