Left edge of the triangle A045975.

Terms

a(0) =1a(1) =2a(2) =9a(3) =24a(4) =45a(5) =90a(6) =133a(7) =224a(8) =297a(9) =450a(10) =561a(11) =792a(12) =949a(13) =1274a(14) =1485a(15) =1920a(16) =2193a(17) =2754a(18) =3097a(19) =3800a(20) =4221a(21) =5082a(22) =5589a(23) =6624a(24) =7225a(25) =8450a(26) =9153a(27) =10584a(28) =11397a(29) =13050