a(0) = 1, a(n) = floor(a(n - 1)*Pi).

Terms

a(0) =1a(1) =3a(2) =9a(3) =28a(4) =87a(5) =273a(6) =857a(7) =2692a(8) =8457a(9) =26568a(10) =83465a(11) =262213a(12) =823766a(13) =2587937a(14) =8130243a(15) =25541911a(16) =80242279a(17) =252088554a(18) =791959549a(19) =2488014301a(20) =7816327450a(21) =24555716894a(22) =77144059797a(23) =242355211526a(24) =761381352089