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A123357
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Kekulé numbers for certain benzenoids (see the Cyvin-Gutman book for details).
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2
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1, 6, 40, 272, 1856, 12672, 86528, 590848, 4034560, 27549696, 188121088, 1284571136, 8771600384, 59896233984, 408997068800, 2792806678528, 19070476877824, 130221361594368, 889207077732352, 6071885729103872, 41461429210972160, 283116347854946304, 1933239349151793152
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history;
text;
internal format)
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OFFSET
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0,2
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LINKS
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FORMULA
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MAPLE
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option remember;
if n <= 1 then
op(n+1, [1, 6]) ;
else
8*(procname(n-1)-procname(n-2)) ;
end if
end proc:
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MATHEMATICA
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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