Number of 4 element sets of distinct integer sided rectangles that fill an n X n square.

Terms

a(0) =0a(1) =0a(2) =0a(3) =3a(4) =15a(5) =35a(6) =75a(7) =119a(8) =210a(9) =289a(10) =441a(11) =574a(12) =804a(13) =993a(14) =1329a(15) =1584a(16) =2031a(17) =2378a(18) =2952a(19) =3386a(20) =4122a(21) =4654a(22) =5550a(23) =6211a(24) =7284a(25) =8064a(26) =9354a(27) =10263a(28) =11763a(29) =12839