Number of ways three L-tiles can be placed on an n X n square.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =11a(5) =196a(6) =1195a(7) =4544a(8) =13215a(9) =32276a(10) =69671a(11) =137120a(12) =251139a(13) =434180a(14) =715891a(15) =1134496a(16) =1738295a(17) =2587284a(18) =3754895a(19) =5329856a(20) =7418171a(21) =10145220a(22) =13657979a(23) =18127360a(24) =23750671a(25) =30754196a(26) =39395895a(27) =49968224a(28) =62801075a(29) =78264836