87209

Appears in sequences

• a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026626.at n=8A026962
• 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, 1), (-1, 0, 0), (-1, 1, -1), (1, -1, 0), (1, 1, 0)}.at n=10A149127
• a(n) = Sum_{k=1..n} k^2*tau_3(k), where tau_3 is A007425.at n=27A319088