21870000

Appears in sequences

• Number of (n+1)X(n+1) arrays of permutations of 0..(n+1)^2-1 with each element having index change +-(.,.) 0,0 or 1,2.at n=5A263988
• a(n) = Product_{d|n, d<n} A276086(d).at n=29A319708