Number of nonequivalent ways to place 3 points on an n X n square grid so that no more than 2 points are on a vertical or horizontal straight line.

A279447

Number of nonequivalent ways to place 3 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) =14a(3) =73a(4) =301a(5) =890a(6) =2321a(7) =5166a(8) =10654a(9) =20055a(10) =35880a(11) =60511a(12) =98419a(13) =153608a(14) =233331a(15) =343820a(16) =496076a(17) =699261a(18) =969234a(19) =1318885a(20) =1770185a(21) =2340646a(22) =3059749a(23) =3950618a(24) =5051786a(25) =6393075a(26) =8023756a(27) =9981531a(28) =12328239a(29) =15110740

External references