105768domain: NAppears in sequencesGreedy frac multiples of 1/Pi: a(1)=1, Sum_{n>0} frac(a(n)*x) = 1 at x=1/Pi, where "frac(y)" denotes the fractional part of y.at n=34A080142Number of horizontally convex polyoctagons containing n regular polygons (squares or octagons).at n=9A323260