a(1) = floor(Pi) = 3; a(n+1) = floor(a(n)*Pi).

Terms

a(0) =3a(1) =9a(2) =28a(3) =87a(4) =273a(5) =857a(6) =2692a(7) =8457a(8) =26568a(9) =83465a(10) =262213a(11) =823766a(12) =2587937a(13) =8130243a(14) =25541911a(15) =80242279a(16) =252088554a(17) =791959549a(18) =2488014301a(19) =7816327450a(20) =24555716894a(21) =77144059797a(22) =242355211526a(23) =761381352089