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EXAMPLE
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The a(3) = 15 edge-sets:
{12,23,31} {12,13,21,32} {12,13,21,23,31} {12,13,21,23,31,32}
{13,21,32} {12,13,23,31} {12,13,21,23,32}
{12,21,23,31} {12,13,21,31,32}
{12,23,31,32} {12,13,23,31,32}
{13,21,23,32} {12,21,23,31,32}
{13,21,31,32} {13,21,23,31,32}
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