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EXAMPLE
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Non-isomorphic representatives of the a(1) = 1 through a(4) = 17 trees:
{1} {1,2} {1,2,3} {1,2,3,4}
{{1},{1,2}} {{1},{1,2,3}}
{{1},{2,3}} {{1,2},{1,2}}
{{1,2},{1,3}}
{{1},{2,3,4}}
{{1,2},{3,4}}
{{1},{1},{1,2}}
{{1},{1},{2,3}}
{{1},{2},{1,2}}
{{1},{2},{1,3}}
{{1},{2},{3,4}}
{{1},{{1},{1,2}}}
{{1},{{1},{2,3}}}
{{1},{{2},{1,2}}}
{{1},{{2},{1,3}}}
{{1},{{2},{3,4}}}
{{2},{{1},{1,3}}}
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