"BIK" (reversible, indistinct, unlabeled) transform of 1,3,5,7...

Terms

a(0) =1a(1) =4a(2) =9a(3) =25a(4) =63a(5) =183a(6) =513a(7) =1521a(8) =4455a(9) =13311a(10) =39609a(11) =118665a(12) =355023a(13) =1064583a(14) =3190833a(15) =9571041a(16) =28704375a(17) =86108751a(18) =258300009a(19) =774886905a(20) =2324581983a(21) =6973706583a(22) =20920883553a(23) =62762532561a(24) =188286889095a(25) =564860312991