a(n)=T(n,n+3), array T as in A049735.

Terms

a(0) =29a(1) =57a(2) =97a(3) =145a(4) =213a(5) =285a(6) =373a(7) =481a(8) =593a(9) =709a(10) =853a(11) =997a(12) =1161a(13) =1353a(14) =1533a(15) =1741a(16) =1941a(17) =2177a(18) =2409a(19) =2661a(20) =2933a(21) =3189a(22) =3505a(23) =3793a(24) =4109a(25) =4429a(26) =4765a(27) =5137a(28) =5489a(29) =5877