OFFSET
0,7
COMMENTS
a(n) = 0 for n == 5 (mod 6).
LINKS
Vladimir Shevelev, Combinatorial identities generated by difference analogs of hyperbolic and trigonometric functions of order n, arXiv:1706.01454 [math.CO], 2017.
Wikipedia, Circulant matrix
MATHEMATICA
ro[n_] := Table[(-1)^(j-1) Sum[(-1)^k Binomial[n, 6k+j-1], {k, 0, n/6}], {j, 1, 6}];
M[n_] := Table[RotateRight[ro[n], m], {m, 0, 5}];
a[n_] := Det[M[n]];
Table[a[n], {n, 0, 18}] (* Jean-François Alcover, Aug 10 2018 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Vladimir Shevelev and Peter J. C. Moses, Aug 05 2017
STATUS
approved