Structured triakis tetrahedral numbers (vertex structure 4).

Terms

a(0) =1a(1) =8a(2) =30a(3) =76a(4) =155a(5) =276a(6) =448a(7) =680a(8) =981a(9) =1360a(10) =1826a(11) =2388a(12) =3055a(13) =3836a(14) =4740a(15) =5776a(16) =6953a(17) =8280a(18) =9766a(19) =11420a(20) =13251a(21) =15268a(22) =17480a(23) =19896a(24) =22525a(25) =25376a(26) =28458a(27) =31780a(28) =35351a(29) =39180