EULER transform of A064831 (with its initial 1 omitted).

Terms

a(0) =1a(1) =3a(2) =15a(3) =61a(4) =250a(5) =966a(6) =3691a(7) =13708a(8) =50198a(9) =180756a(10) =642883a(11) =2259194a(12) =7859454a(13) =27086808a(14) =92579267a(15) =314011481a(16) =1057679231a(17) =3539727315a(18) =11776328715a(19) =38963355007a(20) =128255099092a(21) =420155031109