Ten times hexagonal numbers: 10*n*(2*n-1).

Terms

a(0) =0a(1) =10a(2) =60a(3) =150a(4) =280a(5) =450a(6) =660a(7) =910a(8) =1200a(9) =1530a(10) =1900a(11) =2310a(12) =2760a(13) =3250a(14) =3780a(15) =4350a(16) =4960a(17) =5610a(18) =6300a(19) =7030a(20) =7800a(21) =8610a(22) =9460a(23) =10350a(24) =11280a(25) =12250a(26) =13260a(27) =14310a(28) =15400a(29) =16530