OFFSET
0,2
COMMENTS
Conjecture : a(2n)=1 mod 4 for all n, a(2n+1)=0 for all n.
MAPLE
MATHEMATICA
A105594[n_, k_] := A105594[n, k] = Sum[Abs[MoebiusMu[ Binomial[n, j]]*Mod[Binomial[j, k], 2]], {j, 0, n}]//Mod[#, 2]&;
Table[a[n], {n, 0, 50}] (* Jean-François Alcover, Aug 01 2023, after R. J. Mathar *)
CROSSREFS
KEYWORD
easy,sign
AUTHOR
Paul Barry, Apr 14 2005
STATUS
approved