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

Terms

a(0) =0a(1) =0a(2) =1a(3) =3a(4) =9a(5) =28a(6) =88a(7) =278a(8) =873a(9) =2743a(10) =8616a(11) =27067a(12) =85033a(13) =267138a(14) =839238a(15) =2636541a(16) =8282935a(17) =26021607a(18) =81749288a(19) =256822959a(20) =806833118a(21) =2534740993a(22) =7963123681a(23) =25016890852a(24) =78592880514a(25) =246906816045a(26) =775680639403