769676

Appears in sequences

• Eight white queens and one red queen on a 3 X 3 chessboard. G.f.: (1+x)/(1-5*x-2*x^2).at n=8A180037
• Strings of 6 digits from 1...9, such that no formula using the single digits in the given order exists that evaluates to 0.at n=28A288356