609638400

Appears in sequences

• a(0)=1; a(n) is the smallest positive integer such that lcm(a(n-1), a(n)) = n!.at n=14A129108
• a(n) = (2*n)!*(2*n+1)!/n! = n!*A000909(n), n=0,1...at n=4A161149
• a(n) = n! / A055773(n).at n=14A182922
• Number of n X n symmetric binary matrices with each 1 adjacent to exactly 1 antidiagonally neighboring 1.at n=10A191650