Sequence with Hankel transform equal to the Somos-4 sequence A006769(n+2).

Terms

a(0) =1a(1) =0a(2) =-1a(3) =-1a(4) =-1a(5) =-1a(6) =1a(7) =8a(8) =23a(9) =45a(10) =55a(11) =-14a(12) =-317a(13) =-1095a(14) =-2459a(15) =-3574a(16) =-681a(17) =16124a(18) =64605a(19) =159483a(20) =260869a(21) =134374a(22) =-906919a(23) =-4228769a(24) =-11317061a(25) =-20327731a(26) =-15742753a(27) =52640154a(28) =293447719a(29) =847451759