A198803 Number of closed paths of length 17n whose steps are 17th roots of unity.
1, 355687428096000, 2252447502438386084347676160000000, 91637618063484032681381970173925718228992000000000000, 8528384964488882787308232082310780143738202829970606470279000000000000000
Offset: 0
Keywords
Links
- Andrew Howroyd, Table of n, a(n) for n = 0..40
- Gilbert Labelle and Annie Lacasse, Closed paths whose steps are roots of unity, in FPSAC 2011, Reykjavik, Iceland DMTCS proc. AO, 2011, 599-610.
Programs
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PARI
a(n) = (17*n)!/(n!)^17; \\ Andrew Howroyd, Nov 01 2018
Formula
a(n) = (17*n)!/(n!)^17. - Andrew Howroyd, Nov 01 2018
Extensions
Sequence redefined and a(2)-a(4) from Andrew Howroyd, Nov 01 2018
Comments