First differences of A109975.

Terms

a(0) =1a(1) =2a(2) =5a(3) =11a(4) =24a(5) =52a(6) =112a(7) =240a(8) =512a(9) =1088a(10) =2304a(11) =4864a(12) =10240a(13) =21504a(14) =45056a(15) =94208a(16) =196608a(17) =409600a(18) =851968a(19) =1769472a(20) =3670016a(21) =7602176a(22) =15728640a(23) =32505856a(24) =67108864a(25) =138412032a(26) =285212672a(27) =587202560a(28) =1207959552a(29) =2483027968