Floor( Pi * (3/2)^n ).

Terms

a(0) =3a(1) =4a(2) =7a(3) =10a(4) =15a(5) =23a(6) =35a(7) =53a(8) =80a(9) =120a(10) =181a(11) =271a(12) =407a(13) =611a(14) =917a(15) =1375a(16) =2063a(17) =3095a(18) =4642a(19) =6964a(20) =10446a(21) =15669a(22) =23504a(23) =35257a(24) =52885a(25) =79328a(26) =118993a(27) =178489a(28) =267734a(29) =401602