a(n) = 225*2^n - 235.

Terms

a(0) =-10a(1) =215a(2) =665a(3) =1565a(4) =3365a(5) =6965a(6) =14165a(7) =28565a(8) =57365a(9) =114965a(10) =230165a(11) =460565a(12) =921365a(13) =1842965a(14) =3686165a(15) =7372565a(16) =14745365a(17) =29490965a(18) =58982165a(19) =117964565a(20) =235929365a(21) =471858965a(22) =943718165a(23) =1887436565a(24) =3774873365a(25) =7549746965a(26) =15099494165a(27) =30198988565a(28) =60397977365a(29) =120795954965