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Search: id:A007589
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| A007589 |
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Dodecahedral surface numbers: 2((3n-7)^2 +21).
(Formerly M5083)
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+0
1
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| 0, 1, 20, 50, 92, 170, 284, 434, 620, 842, 1100, 1394, 1724, 2090, 2492, 2930, 3404, 3914, 4460, 5042, 5660, 6314, 7004, 7730, 8492, 9290, 10124, 10994, 11900, 12842, 13820, 14834, 15884, 16970, 18092, 19250
(list; graph; listen)
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OFFSET
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0,3
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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FORMULA
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a(n) = Vertices + Edges*(n-2) + Faces*facenumber(n-3) = 20 + 30(n-2) + 12*A000326(n-3) - Mitch Harris (Harris.Mitchell(AT)mgh.harvard.edu), Oct 25 2006
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CROSSREFS
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Sequence in context: A135286 A053245 A115882 this_sequence A049390 A128905 A008524
Adjacent sequences: A007586 A007587 A007588 this_sequence A007590 A007591 A007592
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), R. K. Guy.
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