a(n) = 36*n^2 + n.

Terms

a(0) =37a(1) =146a(2) =327a(3) =580a(4) =905a(5) =1302a(6) =1771a(7) =2312a(8) =2925a(9) =3610a(10) =4367a(11) =5196a(12) =6097a(13) =7070a(14) =8115a(15) =9232a(16) =10421a(17) =11682a(18) =13015a(19) =14420a(20) =15897a(21) =17446a(22) =19067a(23) =20760a(24) =22525a(25) =24362a(26) =26271a(27) =28252a(28) =30305a(29) =32430