Duplicate of A014635.

Terms

a(0) =0a(1) =6a(2) =28a(3) =66a(4) =120a(5) =190a(6) =276a(7) =378a(8) =496a(9) =630a(10) =780a(11) =946a(12) =1128a(13) =1326a(14) =1540a(15) =1770a(16) =2016a(17) =2278