Shifts left under transform in formula line.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =3a(6) =4a(7) =5a(8) =7a(9) =9a(10) =12a(11) =15a(12) =18a(13) =23a(14) =29a(15) =35a(16) =44a(17) =54a(18) =66a(19) =81a(20) =98a(21) =119a(22) =143a(23) =172a(24) =206a(25) =246a(26) =294a(27) =350a(28) =416a(29) =492