Multiplies by 2 and shifts right under the XOR BINOMIAL transform (A099901).

Terms

a(0) =1a(1) =3a(2) =7a(3) =11a(4) =23a(5) =59a(6) =103a(7) =139a(8) =279a(9) =827a(10) =1895a(11) =2955a(12) =5655a(13) =14395a(14) =24679a(15) =32907a(16) =65815a(17) =197435a(18) =460647a(19) =723851a(20) =1512983a(21) =3881019a(22) =6774887a(23) =9142411a(24) =18219287a(25) =54002491a(26) =123733863a(27) =192940939a(28) =369104407a(29) =939538491