Structured truncated cubic numbers.

Terms

a(0) =1a(1) =24a(2) =100a(3) =260a(4) =535a(5) =956a(6) =1554a(7) =2360a(8) =3405a(9) =4720a(10) =6336a(11) =8284a(12) =10595a(13) =13300a(14) =16430a(15) =20016a(16) =24089a(17) =28680a(18) =33820a(19) =39540a(20) =45871a(21) =52844a(22) =60490a(23) =68840a(24) =77925a(25) =87776a(26) =98424a(27) =109900a(28) =122235a(29) =135460