Shifts left when Euler transform applied 6 times.

Terms

a(0) =0a(1) =1a(2) =1a(3) =7a(4) =34a(5) =209a(6) =1260a(7) =8219a(8) =54677a(9) =374904a(10) =2617996a(11) =18588586a(12) =133708072a(13) =972484206a(14) =7139186644a(15) =52832157095a(16) =393700752053