2540160000

Appears in sequences

• Sets record for f(n) = |{(a,b):a*b=n and a|b}|. Also squares of highly composite numbers A002182.at n=26A046952
• Even squares which can be expressed as the product of a number and its reversal in at least two different ways.at n=19A083406
• Squares which can be expressed as the product of a number and its reversal in at least two different ways.at n=19A083408
• a(n) = determinant of the n X n matrix m(i,j)=(i+j+3)!/i!/j!.at n=4A105188
• Triangle T(n, k) = c(n)/(c(k)*c(n-k)) where c(n) = (n-2)!*(n-1)!*n!*(n+1)!*(n+3)!/1440 with c(0) = c(1) = 1 and c(2) = 2, read by rows.at n=31A173890
• Triangle T(n, k) = c(n)/(c(k)*c(n-k)) where c(n) = (n-2)!*(n-1)!*n!*(n+1)!*(n+3)!/1440 with c(0) = c(1) = 1 and c(2) = 2, read by rows.at n=32A173890
• a(n) = [n/2]!*[(n+1)/2]!*C([n/2],3)*C([(n+1)/2],3).at n=12A226284
• Squares which can be expressed as the product of a number and its reversal in exactly two ways.at n=15A325150