Shifts left when INVERT transform applied thrice.

Terms

a(0) =1a(1) =1a(2) =4a(3) =19a(4) =100a(5) =562a(6) =3304a(7) =20071a(8) =124996a(9) =793774a(10) =5120632a(11) =33463102a(12) =221060008a(13) =1473830308a(14) =9904186192a(15) =67015401391a(16) =456192667396