Round(Pi^(n+1)/(Pi^2 + 1)).

Terms

a(0) =0a(1) =1a(2) =3a(3) =9a(4) =28a(5) =88a(6) =278a(7) =873a(8) =2742a(9) =8616a(10) =27067a(11) =85032a(12) =267137a(13) =839237a(14) =2636540a(15) =8282934a(16) =26021606a(17) =81749286a(18) =256822958a(19) =806833117a(20) =2534740992a(21) =7963123679a(22) =25016890851a(23) =78592880513a(24) =246906816043a(25) =775680639401