Number of ways 2 domicules can be placed on an n X n square.

Terms

a(0) =0a(1) =0a(2) =3a(3) =110a(4) =657a(5) =2172a(6) =5375a(7) =11178a(8) =20685a(9) =35192a(10) =56187a(11) =85350a(12) =124553a(13) =175860a(14) =241527a(15) =324002a(16) =425925a(17) =550128a(18) =699635a(19) =877662a(20) =1087617a(21) =1333100a(22) =1617903a(23) =1946010a(24) =2321597a(25) =2749032a(26) =3232875a(27) =3777878a(28) =4388985a(29) =5071332