79180

Appears in sequences

• a(n) = Sum_{ r = 0 to n} L(n,r), where L(n,r) (A067049) = lcm(n, n-1, n-2, ..., n-r+1)/lcm(1, 2, 3, ..., r).at n=21A061297
• Coefficient of x in the reduction by x^2->x+1 of the polynomial p(n,x) defined below in Comments.at n=20A192762
• Number of nX3 0..1 arrays with every element unequal to 0, 1, 3, 5 or 6 king-move adjacent elements, with upper left element zero.at n=14A304664