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A007219
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Number of serial isogons of order 8n (or Golygons).
(Formerly M5204)
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2
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1, 28, 2108, 227322, 30276740, 4541771016, 739092675672, 127674038970623, 23085759901610016, 4327973308197103600, 835531767841066680300, 165266721954751746697155, 33364181616540879268092840
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| L. Sallows, M. Gardner, R. K. Guy and D. E. Knuth, Serial isogons of 90 degrees, Math. Mag. 64 (1991), 315-324.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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CROSSREFS
| Cf. A107350, A060005.
Sequence in context: A004705 A197438 A202811 * A203751 A178187 A184134
Adjacent sequences: A007216 A007217 A007218 * A007220 A007221 A007222
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KEYWORD
| nonn,easy,nice
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AUTHOR
| Simon Plouffe (simon.plouffe(AT)gmail.com)
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EXTENSIONS
| Two more terms from N. J. A. Sloane (njas(AT)research.att.com) (from the reference), May 23 2005
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