425500

Appears in sequences

• Augmented amicable pairs (smaller member of each pair).at n=5A007992
• Eight rooks and one berserker on a 3 X 3 chessboard. G.f.: (1 + x^2)/(1 - 4*x + x^2 + 2*x^3).at n=10A180143
• Variation on betrothed numbers.at n=10A281265