Number of ways two L-tiles (with rotation) can be placed on an n X n square.

Terms

a(0) =0a(1) =0a(2) =22a(3) =336a(4) =1422a(5) =3952a(6) =8790a(7) =16992a(8) =29806a(9) =48672a(10) =75222a(11) =111280a(12) =158862a(13) =220176a(14) =297622a(15) =393792a(16) =511470a(17) =653632a(18) =823446a(19) =1024272a(20) =1259662a(21) =1533360a(22) =1849302a(23) =2211616a(24) =2624622a(25) =3092832a(26) =3620950a(27) =4213872a(28) =4876686a(29) =5614672