53966

Appears in sequences

• a(n) = T(n,n-6), array T as in A055807.at n=16A055811
• First differences of triangular numbers with square pyramidal indices.at n=10A077538
• a(1) = 1, a(n+1) = a(n) + gpf(Sum_{i=1..n} a(i)), where gpf=A006530 (greatest prime factor).at n=21A080182
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, 1), (0, 1, -1), (1, 0, 1), (1, 1, 0)}.at n=8A150776
• Product_{n>=1} (1 + x^n)^a(n) = g.f. of A001970 (partitions of partitions).at n=41A305841
• a(n) = Sum_{k=1..n} k * lcm(k,n).at n=21A344508