OFFSET
1,4
COMMENTS
Sum over the odd-numbered columns in row n of A048152.
MAPLE
A228587 := proc(n)
local a, o ;
a := 0 ;
for o from 1 to n-1 by 2 do
a := a+ modp(o^2, n) ;
end do:
a ;
end proc:
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
R. J. Mathar, Aug 27 2013
STATUS
approved