"DHK" (bracelet, identity, unlabeled) transform of A035353.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =11a(6) =33a(7) =103a(8) =330a(9) =1077a(10) =3556a(11) =11895a(12) =40187a(13) =137049a(14) =471070a(15) =1630819a(16) =5680854a(17) =19899698a(18) =70053093a(19) =247711242a(20) =879441789a(21) =3133648932a(22) =11202930544a(23) =40172365842a(24) =144453506494a(25) =520759972064