OFFSET
1,1
COMMENTS
Equivalently it represents the squares that are white, counting from bottom left corner and up.
FORMULA
a(1) = 2
a(n) = a(n-1) + 2 + (mod(a(n-1)+1, 8) == 0) - (mod(a(n-1), 8) == 0)
MATHEMATICA
sqColor[n_] := Mod[n, 2] + (1 - 2*Mod[n, 2])*Mod[Floor[(n - 1)/8], 2]; Select[Range[64], sqColor[#] == 0 &]
CROSSREFS
KEYWORD
nonn,easy,fini,full
AUTHOR
Jonas Hallgren, Jul 26 2013
STATUS
approved