Question

Number sequesnce...what next #?
4 6 10 18 34 66 130

Answer 1

`a_1=2+2^1=2+2=4\\a_2=2+2^2=2+4=6\\a_3=2+2^3=2+8=10\\a_4=2+2^4=2+16=18\\a_5=2+2^5=2+32=34\\a_6=2+2^6=2+64=66\\a_7=2+2^7=2+128=130\\\boxed{a_8=2+2^8=2+256=258}\\\boxed{a_9=2+2^9=2+512=514}\\\boxed{a_(10)=2+2^(10)=2+1024=1026}\\\vdots`