a(n) = 10 + floor(Sum_{j=1..n-1} a(j) / 2).

Terms

a(0) =10a(1) =15a(2) =22a(3) =33a(4) =50a(5) =75a(6) =112a(7) =168a(8) =252a(9) =378a(10) =567a(11) =851a(12) =1276a(13) =1914a(14) =2871a(15) =4307a(16) =6460a(17) =9690a(18) =14535a(19) =21803a(20) =32704a(21) =49056a(22) =73584a(23) =110376a(24) =165564a(25) =248346a(26) =372519a(27) =558779a(28) =838168a(29) =1257252