843621600

Appears in sequences

• a(n) = 8*binomial(2*n+1,n-3)/(n+5).at n=14A003518
• a(n) = number of (s(0), s(1), ..., s(2*n-1)) such that s(i) is a nonnegative integer and |s(i) - s(i-1)| = 1 for i = 1,2,...,n, s(0) = 3, s(2*n-1) = 6. Also a(n) = T(2*n-1,n-2), where T is defined in A026022.at n=15A026027
• Arises from enumeration of a certain class of partial zig-zag knight's paths on the square grid.at n=34A368380