a(n) = n*(n+5).

Terms

a(0) =0a(1) =6a(2) =14a(3) =24a(4) =36a(5) =50a(6) =66a(7) =84a(8) =104a(9) =126a(10) =150a(11) =176a(12) =204a(13) =234a(14) =266a(15) =300a(16) =336a(17) =374a(18) =414a(19) =456a(20) =500a(21) =546a(22) =594a(23) =644a(24) =696a(25) =750a(26) =806a(27) =864a(28) =924a(29) =986