304525domain: NAppears in sequencesCubes written in base 6.at n=28A004636Beach-Williams Pell numbers of type pqrs (p,q,r,s primes).at n=15A212080Number of squares and rectangles in the interior of the square with vertices (n,0), (0,n), (-n,0) and (0,-n) in a square (x,y)-grid.at n=25A330805