a(n) = 22 + floor( Sum_{j=1..n-1} a(j)/2 ).

Terms

a(0) =22a(1) =33a(2) =49a(3) =74a(4) =111a(5) =166a(6) =249a(7) =374a(8) =561a(9) =841a(10) =1262a(11) =1893a(12) =2839a(13) =4259a(14) =6388a(15) =9582a(16) =14373a(17) =21560a(18) =32340a(19) =48510a(20) =72765a(21) =109147a(22) =163721a(23) =245581a(24) =368372a(25) =552558a(26) =828837a(27) =1243255a(28) =1864883a(29) =2797324