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EXAMPLE
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Non-isomorphic representatives of the a(1) = 1 through a(4) = 15 antichain covers:
1: {{1}}
3: {{1,2},{1,3},{2,3}}
4: {{1,2},{1,3},{2,4},{3,4}}
{{1,3},{1,4},{2,3},{2,4}}
{{1,2},{1,4},{2,3},{3,4}}
{{1,4},{2,4},{3,4},{1,2,3}}
{{1,3},{2,3},{3,4},{1,2,4}}
{{1,2},{2,3},{2,4},{1,3,4}}
{{1,2},{1,3},{1,4},{2,3,4}}
{{1,3},{1,4},{2,3},{2,4},{3,4}}
{{1,2},{1,4},{2,3},{2,4},{3,4}}
{{1,2},{1,3},{2,3},{2,4},{3,4}}
{{1,2},{1,3},{1,4},{2,4},{3,4}}
{{1,2},{1,3},{1,4},{2,3},{3,4}}
{{1,2},{1,3},{1,4},{2,3},{2,4}}
{{1,2,3},{1,2,4},{1,3,4},{2,3,4}}
{{1,2},{1,3},{1,4},{2,3},{2,4},{3,4}}
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