Listen carefully to the tracks I mentioned (Key to the Gate, En ring til aa herske, Lost Wisdom, and Snu mikrokosmos tegn) - the 1 4 3 turns up in each of them, in E or C, as I mentioned. Lost Wisdom has it at 2:50, En ring til aa herske has it from 2:28 to 3:17 and from 5:53 onwards. Generally, it seems to be a "culmination" motif, as Key to the Gate, En ring til aa herske, and Lost Wisdom have it either at/towards the end or under solos.
Edit: holy shit, it is the opening riff of Chainsaw Gutsfuck. Subtle/subconscious tip of the hat to Mayhem, perhaps...