"DIK" (bracelet, indistinct, unlabeled) transform of 1,3,5,7...

Terms

a(0) =1a(1) =4a(2) =9a(3) =22a(4) =46a(5) =109a(6) =237a(7) =571a(8) =1362a(9) =3459a(10) =8881a(11) =23698a(12) =63846a(13) =175489a(14) =485941a(15) =1359240a(16) =3821170a(17) =10803787a(18) =30654681a(19) =87295726a(20) =249262766a(21) =713583861a(22) =2047210813a(23) =5885081941a(24) =16947632202a(25) =48885431563a(26) =141220349049