Shadow of Pi.

Terms

a(0) =1a(1) =4a(2) =18a(3) =33a(4) =42a(5) =44a(6) =50a(7) =55a(8) =90a(9) =98a(10) =195a(11) =288a(12) =311a(13) =395a(14) =457a(15) =521a(16) =859a(17) =891a(18) =898a(19) =1848a(20) =1876a(21) =2717a(22) =3688a(23) =3757a(24) =3796a(25) =4733a(26) =5243a(27) =5301a(28) =5321a(29) =6295