69900

Appears in sequences

• Number of n X 2 arrays of the minimum value of corresponding elements and their horizontal, vertical, diagonal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..3 n X 2 array.at n=16A219454
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 561", based on the 5-celled von Neumann neighborhood.at n=40A272937
• G.f. A(x) satisfies: (1 - x*A(x))^7 = 1 - 7*x - x^7*A(x^7).at n=7A352706
• a(n) = Sum_{k=0..n} 2^(n-k) * floor(k/4).at n=19A368346