506250

Appears in sequences

• Number of 2 X 2 matrices with all terms in {0,1,...,n} and even determinant.at n=29A210369
• Number of 2 X 2 matrices having all terms in {1,...,n} and even determinant.at n=29A211064
• Number of nX3 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with every occupancy equal to zero or two.at n=9A221414
• Numbers which have identical primes in n and d(n) but are not refactorable.at n=7A235525