76908

Appears in sequences

• Triangle read by rows: counts permutations by number of big descents.at n=30A120434
• a(n) is the smallest number m such that sigma(m)=n*pi(m), or 0 if no such m exists.at n=26A137602
• Triangle T(n,k), read by rows, given by (0,1,0,2,0,3,0,4,0,5,0,6,0,7,0,8,0,9,...) DELTA (2,0,3,0,4,0,5,0,6,0,7,0,8,0,9,...), where DELTA is the operator defined in A084938.at n=42A199335
• Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 246", based on the 5-celled von Neumann neighborhood.at n=32A287135
• G.f. A(x) satisfies: A(x) = x + x^2 * exp( Sum_{k>=1} A(x^k)^3 / (k*x^(2*k)) ).at n=11A363465
• a(n) is the number of isosceles trapezoids in a triangular grid of side length n.at n=24A389363