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

Terms

a(0) =1a(1) =2a(2) =6a(3) =17a(4) =50a(5) =146a(6) =430a(7) =1267a(8) =3746a(9) =11091a(10) =32900a(11) =97716a(12) =290586a(13) =864980a(14) =2577032a(15) =7683397a(16) =22922874a(17) =68427057a(18) =204362172a(19) =610604629a(20) =1825092080a(21) =5457016431a(22) =16321318264a(23) =48828168580a(24) =146112907266a(25) =437319580738