Shifts left and divides by 2 under the XOR BINOMIAL transform (A099902).

Terms

a(0) =1a(1) =2a(2) =6a(3) =14a(4) =22a(5) =46a(6) =118a(7) =206a(8) =278a(9) =558a(10) =1654a(11) =3790a(12) =5910a(13) =11310a(14) =28790a(15) =49358a(16) =65814a(17) =131630a(18) =394870a(19) =921294a(20) =1447702a(21) =3025966a(22) =7762038a(23) =13549774a(24) =18284822a(25) =36438574a(26) =108004982a(27) =247467726a(28) =385881878a(29) =738208814