A068294 - OEIS

%I #15 Aug 22 2024 17:13:46

%S 1,24,1344,187008,65012352,56638464768,123968096842368,

%T 682463815024774272,9455897825697924931968,

%U 329835949030491781985964672,28967729014957963606903092579840,6405563550899359667890368716213003520,3566277295414164369700428069692324488565760,4998812913455162820842387241261713638306330756608

%N 1/5 the number of colorings of an n X n octagonal array with 5 colors.

%H Christian Gaetz and Yibo Gao, <a href="https://arxiv.org/abs/2408.07863">Interlacing triangles, Schubert puzzles, and graph colorings</a>, arXiv:2408.07863 [math.CO], 2024. See p. 15.

%Y Cf. A068239-A068305, A000332, A002417, A027441, A212208, A212209.

%K nonn

%O 1,2

%A _R. H. Hardin_, Feb 24 2002

%E a(8) from _Alois P. Heinz_, May 03 2012

%E a(9)-a(14) from _Andrew Howroyd_, Jun 25 2017