The DK website only did a crude rounding to get the number of seats by the Wyoming rule. To do it right I first divided the US (minus DC) apportionment population (which includes overseas person not used in redistricting) by the population of WY to get 544 seats. Then I used the official algorithm to get the apportionment for each state. This is the resulting map.
If the objective is to have each representative, represent a Wyoming-sized district, why calculate the overall size of the House? Why not just divide the population of the state by Wyoming's population and round?