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

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =46a(6) =4431a(7) =73098a(8) =587149a(9) =3125278a(10) =12712329a(11) =42731866a(12) =124522115a(13) =324628878a(14) =773900299a(15) =1714106922a(16) =3569586561a(17) =7053577342a(18) =13321444117a(19) =24185953530a(20) =42413141575a(21) =72121174766a(22) =119308962279a(23) =192546161866a(24) =303861667221a(25) =469873699038a(26) =713211276481