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EXAMPLE
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The a(1) = 1 through a(9) = 10 subsets:
{1} {1} {1} {1} {1} {1} {1} {1} {1}
{2} {2,3} {2,3} {2,3} {2,3} {2,3,7} {2,5,6} {2,6,7}
{3,4} {2,5} {2,5,6} {2,5,6} {2,5,8} {3,4,5}
{3,4,5} {3,4,5} {2,6,7} {2,6,7} {3,5,7}
{4,5,6} {3,4,5} {3,4,5} {2,3,7,8}
{3,5,7} {3,5,7} {2,5,6,9}
{4,5,6,7} {2,3,7,8} {2,5,8,9}
{4,5,6,7} {4,5,6,7}
{5,6,7,8} {4,6,7,9}
{5,6,7,8,9}
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