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EXAMPLE
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For n = 4 the a(4) = 13 solutions are
{{1,0,0,0}} {{1,0,0,0}} {{1,0,0,0}}
{{0,1,0,0}} {{0,0,1,0}} {{0,0,0,1}}
{{0,0,0,0}} {{0,0,0,0}} {{0,0,0,0}}
{{0,0,0,0}} {{0,0,0,0}} {{0,0,0,0}}
—————————————————————————————————————
{{1,0,0,0}} {{1,0,0,0}} {{1,0,0,0}}
{{0,0,0,0}} {{0,0,0,0}} {{0,0,0,0}}
{{0,0,1,0}} {{0,0,0,1}} {{0,0,0,0}}
{{0,0,0,0}} {{0,0,0,0}} {{0,0,0,1}}
—————————————————————————————————————
{{0,1,0,0}} {{0,1,0,0}} {{0,1,0,0}}
{{1,0,0,0}} {{0,0,1,0}} {{0,0,0,1}}
{{0,0,0,0}} {{0,0,0,0}} {{0,0,0,0}}
{{0,0,0,0}} {{0,0,0,0}} {{0,0,0,0}}
—————————————————————————————————————
{{0,1,0,0}} {{0,1,0,0}} {{0,1,0,0}}
{{0,0,0,0}} {{0,0,0,0}} {{0,0,0,0}}
{{0,0,1,0}} {{0,0,0,1}} {{0,0,0,0}}
{{0,0,0,0}} {{0,0,0,0}} {{0,0,1,0}}
—————————————————————————————————————
{{0,0,0,0}}
{{0,1,0,0}}
{{0,0,1,0}}
{{0,0,0,0}}
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