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Search: id:A007219
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| A007219 |
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Number of serial isogons of order 8n (or Golygons).
(Formerly M5204)
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+0
3
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| 1, 28, 2108, 227322, 30276740, 4541771016, 739092675672, 127674038970623, 23085759901610016, 4327973308197103600, 835531767841066680300, 165266721954751746697155, 33364181616540879268092840
(list; graph; listen)
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OFFSET
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1,2
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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).
L. Sallows, M. Gardner, R. K. Guy and D. E. Knuth, Serial isogons of 90 degrees, Math. Mag. 64 (1991), 315-324.
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CROSSREFS
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Cf. A107350, A060005.
Sequence in context: A163033 A060335 A004705 this_sequence A100548 A103660 A107444
Adjacent sequences: A007216 A007217 A007218 this_sequence A007220 A007221 A007222
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KEYWORD
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nonn,easy,nice
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AUTHOR
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Simon Plouffe (simon.plouffe(AT)gmail.com)
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EXTENSIONS
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Two more terms from N. J. A. Sloane (njas(AT)research.att.com) (from the reference), May 23 2005
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