Shifts 4 places left under inverse binomial transform.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =1a(5) =1a(6) =1a(7) =1a(8) =-14a(9) =45a(10) =-101a(11) =189a(12) =-331a(13) =668a(14) =-1932a(15) =7206a(16) =-27779a(17) =101365a(18) =-347439a(19) =1139851a(20) =-3690766a(21) =12258863a(22) =-43341845a(23) =166059261a(24) =-682516519a(25) =2930522990a(26) =-12823188092a(27) =56366526324a(28) =-247898684759