First differences of A045623.

Terms

a(0) =1a(1) =1a(2) =3a(3) =7a(4) =16a(5) =36a(6) =80a(7) =176a(8) =384a(9) =832a(10) =1792a(11) =3840a(12) =8192a(13) =17408a(14) =36864a(15) =77824a(16) =163840a(17) =344064a(18) =720896a(19) =1507328a(20) =3145728a(21) =6553600a(22) =13631488a(23) =28311552a(24) =58720256a(25) =121634816a(26) =251658240a(27) =520093696a(28) =1073741824a(29) =2214592512