The 1849 LDS edition accidentally replaced according with accordingly, an error that resulted from the compositor just having set the two adverbs temporally and spiritually (both end in -ly). This obvious typo was removed in the subsequent LDS edition (1852). The word accordingly occurs only once in the actual text, in Ether 6:20: “and accordingly the people were gathered together”; according, on the other hand, is always followed by either to or as.
Summary: The critical text will maintain the original according in Mosiah 18:29 and elsewhere in the text; accordingly occurs only once in the original text.