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EXAMPLE
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Non-isomorphic representatives of the a(1) = 1 through a(3) = 18 set-systems:
{{1}} {{1}} {{1}}
{{1,2}} {{1,2}}
{{1},{2}} {{1},{2}}
{{1},{1,2}} {{1,2,3}}
{{1},{1,2}}
{{1},{2,3}}
{{1},{1,2,3}}
{{1,2},{1,3}}
{{1},{2},{3}}
{{1,2},{1,2,3}}
{{1},{2},{1,3}}
{{1},{1,2},{1,3}}
{{1},{1,2},{2,3}}
{{1},{2},{1,2,3}}
{{1},{1,2},{1,2,3}}
{{1},{2},{3},{1,2}}
{{1},{2},{1,2},{1,3}}
{{1},{2},{1,2},{1,2,3}}
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