OFFSET
1,3
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..250
EXAMPLE
a(2) = 0 because of the singular matrix 0 =
|1 1|
|2 2|.
MATHEMATICA
nmax = 20; Table[Det[Table[EulerPhi[k*(i-1) + j], {i, 1, k}, {j, 1, k}]], {k, 1, nmax}] (* Vaclav Kotesovec, Feb 24 2019 *)
Table[Det[Partition[EulerPhi[Range[n^2]], n]], {n, 20}] (* Harvey P. Dale, Jul 28 2021 *)
CROSSREFS
KEYWORD
easy,sign
AUTHOR
Jonathan Vos Post, May 27 2006
EXTENSIONS
More terms from Vaclav Kotesovec, Feb 24 2019
STATUS
approved