1064000

Appears in sequences

• a(n) = 100^[n/10] + 2*n*10^[n/10]: inspired by Engel expansion of Pi.at n=32A137507
• Wiener index of the grid P_n x P_n, where P_n is the path graph on n vertices.at n=19A143945
• a(n)=If[IntegerQ[((6*n - 4)/( n + 1))*a(n - 1)], ((6*n - 4)/(n + 1))* a(n - 1), If[IntegerQ[((4*n - 2)/(n + 1))*a( n - 1)], ((4*n - 2)/(n + 1))*a(n - 1), n*a(n - 1)]].at n=11A155581