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%I #22 Feb 06 2024 08:10:26
%S 1,0,0,30,0,360,7650,0,302400,4544400,11226600,324324000,4310633250,
%T 24324300000,437404968000,5634178329780,45972927000000,
%U 697866761592000,8962716395833200,88725951057744000,1258898645656852200
%N Number of closed paths of length n whose steps are 15th roots of unity, U_15(n).
%C U_15(n), (comment in article): For each m >= 1, the sequence (U_m(N)), N >= 0 is P-recursive but is not algebraic when m > 2.
%H Gilbert Labelle and Annie Lacasse, <a href="https://doi.org/10.46298/dmtcs.2937">Closed paths whose steps are roots of unity</a>, in FPSAC 2011, Reykjavik, Iceland DMTCS proc. AO, 2011, 599-610.
%Y Cf. A198808, A321418.
%K nonn
%O 0,4
%A _Simon Plouffe_, Oct 30 2011
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