Number of nonequivalent ways to place 4 points on an n X n square grid so that no more than 2 points are on a vertical or horizontal straight line.

A279448

Number of nonequivalent ways to place 4 points on an n X n square grid so that no more than 2 points are on a vertical or horizontal straight line.

Terms

    a(0) =0a(1) =1a(2) =17a(3) =202a(4) =1397a(5) =6582a(6) =24185a(7) =73496a(8) =195086a(9) =463875a(10) =1013505a(11) =2061426a(12) =3956947a(13) =7222992a(14) =12640817a(15) =21312992a(16) =34801420a(17) =55215621a(18) =85424721a(19) =129174250a(20) =191397185a(21) =278361226a(22) =398108777a(23) =560635032a(24) =778491962a(25) =1066995527a(26) =1445034305a(27) =1935301746a(28) =2565356031a(29) =3367870500

External references