2048000

Appears in sequences

• a(n) = (2*n+1) * (2*n)! / (sqrt(4*(n+1)*Product_{k=1..2*n+1} lcm(k, 2*n+2-k))).at n=17A082292
• The second left hand column of triangle A167580.at n=11A167581
• Numbers of spanning trees of the triangular graphs.at n=3A193154
• Determinant of the n X n matrix with (i,j)-entry equal to 1 or 0 according as i + j is coprime to n or not.at n=32A228885
• Number of (n+1) X (n+1) 0..2 arrays with every 2 X 2 subblock diagonal maximum minus antidiagonal minimum unequal to its neighbors horizontally, vertically, diagonally and antidiagonally.at n=12A253461
• Decimal representation of the n-th iteration of the "Rule 125" elementary cellular automaton starting with a single ON (black) cell.at n=10A267360
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 459", based on the 5-celled von Neumann neighborhood.at n=20A288404
• a(n) = Product_{k=0..9} floor((n+k)/10).at n=43A354600