"DGJ" (bracelet, element, labeled) transform of 2,1,1,1...

Terms

a(0) =1a(1) =2a(2) =3a(3) =7a(4) =21a(5) =41a(6) =178a(7) =1583a(8) =3573a(9) =15205a(10) =106206a(11) =1931645a(12) =5047298a(13) =26136085a(14) =128396115a(15) =1309192204a(16) =40241522045a(17) =123336716525a(18) =727042897270