5 times centered pentagonal numbers: 5*(5*n^2 + 5*n + 2)/2.

Terms

a(0) =5a(1) =30a(2) =80a(3) =155a(4) =255a(5) =380a(6) =530a(7) =705a(8) =905a(9) =1130a(10) =1380a(11) =1655a(12) =1955a(13) =2280a(14) =2630a(15) =3005a(16) =3405a(17) =3830a(18) =4280a(19) =4755a(20) =5255a(21) =5780a(22) =6330a(23) =6905a(24) =7505a(25) =8130a(26) =8780a(27) =9455a(28) =10155a(29) =10880