Number of vertices in truncated tetrahedron with faces that are centered polygons.

Terms

a(0) =1a(1) =21a(2) =95a(3) =259a(4) =549a(5) =1001a(6) =1651a(7) =2535a(8) =3689a(9) =5149a(10) =6951a(11) =9131a(12) =11725a(13) =14769a(14) =18299a(15) =22351a(16) =26961a(17) =32165a(18) =37999a(19) =44499a(20) =51701a(21) =59641a(22) =68355a(23) =77879a(24) =88249a(25) =99501a(26) =111671a(27) =124795a(28) =138909a(29) =154049