a(n) = (A085249(n) - 1)/6.

Terms

a(0) =5a(1) =29a(2) =173a(3) =245a(4) =365a(5) =749a(6) =1037a(7) =1469a(8) =2189a(9) =3413a(10) =3773a(11) =4469a(12) =5117a(13) =6005a(14) =6221a(15) =7661a(16) =8813a(17) =8957a(18) =9005a(19) =11117a(20) =13133a(21) =14837a(22) =18029a(23) =20477a(24) =20981a(25) =22133a(26) =22613a(27) =22781a(28) =26813a(29) =29525