Denominator of 1/n^2-1/(n+2)^2.

Terms

a(0) =0a(1) =9a(2) =16a(3) =225a(4) =144a(5) =1225a(6) =576a(7) =3969a(8) =1600a(9) =9801a(10) =3600a(11) =20449a(12) =7056a(13) =38025a(14) =12544a(15) =65025a(16) =20736a(17) =104329a(18) =32400a(19) =159201a(20) =48400a(21) =233289a(22) =69696a(23) =330625a(24) =97344a(25) =455625a(26) =132496a(27) =613089a(28) =176400a(29) =808201