A sequence with Somos-4 Hankel transform.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =7a(5) =13a(6) =31a(7) =65a(8) =156a(9) =351a(10) =849a(11) =1993a(12) =4866a(13) =11733a(14) =28921a(15) =70997a(16) =176560a(17) =438979a(18) =1100302a(19) =2761797a(20) =6969909a(21) =17625015a(22) =44742636a(23) =113822415a(24) =290416803a(25) =742486655a(26) =1902767481a(27) =4885201701a(28) =12567065582a(29) =32382099109