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A018981
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Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite AST = AlPO4-16 [ Al20P20O80 ] .4 R . 16 H2O.
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0
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0, 6, 24, 192, 924, 6432, 39096, 251712, 1601904, 10498200, 69861552, 472556352, 3225921672, 22211011704, 154049303808
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OFFSET
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2,2
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LINKS
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Table of n, a(n) for n=2..16.
Georg Thimm, Cycle sequences of crystal structures.
Georg Thimm, Personal website (archived).
Georg Thimm, A graph theoretical approach to the analysis, comparison, and enumeration of crystal structures, Dissertation, Goethe University Frankfurt, Germany, 2008.
Georg Thimm and W. E. Klee, Zeolite cycle sequences, Zeolites, 19(5-6) (1997), 422-424.
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CROSSREFS
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Sequence in context: A038033 A064049 A336267 * A052594 A320944 A277985
Adjacent sequences: A018978 A018979 A018980 * A018982 A018983 A018984
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KEYWORD
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nonn,more
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AUTHOR
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Georg Thimm (mgeorg(AT)ntu.edu.sg)
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EXTENSIONS
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a(11)-a(16) from Sean A. Irvine, Mar 12 2019
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STATUS
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approved
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