Sequence whose Hankel transform is the Somos (4) sequence.

Terms

a(0) =1a(1) =1a(2) =3a(3) =6a(4) =15a(5) =34a(6) =83a(7) =198a(8) =488a(9) =1202a(10) =3015a(11) =7608a(12) =19432a(13) =49994a(14) =129779a(15) =339176a(16) =892600a(17) =2362634a(18) =6288156a(19) =16816232a(20) =45170466a(21) =121812152a(22) =329679487a(23) =895171236a(24) =2437885058a(25) =6657311202a(26) =18224979884a(27) =50006899724a(28) =137502724754