INVERT transform of pi (A000720).

Terms

a(0) =1a(1) =0a(2) =1a(3) =2a(4) =3a(5) =7a(6) =12a(7) =24a(8) =45a(9) =85a(10) =163a(11) =309a(12) =588a(13) =1119a(14) =2127a(15) =4046a(16) =7695a(17) =14635a(18) =27835a(19) =52939a(20) =100685a(21) =191493a(22) =364201a(23) =692676a(24) =1317403a(25) =2505573a(26) =4765360a(27) =9063255a(28) =17237439a(29) =32783952