a(n) = (n+5)^3 - n^3.

Terms

a(0) =125a(1) =215a(2) =335a(3) =485a(4) =665a(5) =875a(6) =1115a(7) =1385a(8) =1685a(9) =2015a(10) =2375a(11) =2765a(12) =3185a(13) =3635a(14) =4115a(15) =4625a(16) =5165a(17) =5735a(18) =6335a(19) =6965a(20) =7625a(21) =8315a(22) =9035a(23) =9785a(24) =10565a(25) =11375a(26) =12215a(27) =13085a(28) =13985a(29) =14915