Number of orthogonal rectangles with vertices on an n X n square grid of points but with no vertices on the grid's diagonals.

A285956

Number of orthogonal rectangles with vertices on an n X n square grid of points but with no vertices on the grid's diagonals.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =2a(5) =10a(6) =30a(7) =102a(8) =204a(9) =444a(10) =740a(11) =1300a(12) =1950a(13) =3030a(14) =4242a(15) =6090a(16) =8120a(17) =11032a(18) =14184a(19) =18504a(20) =23130a(21) =29250a(22) =35750a(23) =44110a(24) =52932a(25) =64020a(26) =75660a(27) =90012a(28) =105014a(29) =123214

External references