6-dimensional centered tetrahedral numbers.

Terms

a(0) =1a(1) =8a(2) =36a(3) =120a(4) =330a(5) =792a(6) =1716a(7) =3431a(8) =6427a(9) =11404a(10) =19328a(11) =31494a(12) =49596a(13) =75804a(14) =112848a(15) =164109a(16) =233717a(17) =326656a(18) =448876a(19) =607412a(20) =810510a(21) =1067760a(22) =1390236a(23) =1790643a(24) =2283471a(25) =2885156a(26) =3614248a(27) =4491586a(28) =5540480a(29) =6786900