a(n) = 36*n^2 + 1.

Terms

a(0) =1a(1) =37a(2) =145a(3) =325a(4) =577a(5) =901a(6) =1297a(7) =1765a(8) =2305a(9) =2917a(10) =3601a(11) =4357a(12) =5185a(13) =6085a(14) =7057a(15) =8101a(16) =9217a(17) =10405a(18) =11665a(19) =12997a(20) =14401a(21) =15877a(22) =17425a(23) =19045a(24) =20737a(25) =22501a(26) =24337a(27) =26245a(28) =28225a(29) =30277