309248domain: NAppears in sequencesInteger coefficients arising from a formula for Sum_{m>=1} sin(Pi*m/3)^2/m^2.at n=7A261398Triangle read by rows: Eulerian triangle that produces sums of even powers.at n=24A296229Number of subsets of {-n..n} whose sum of reciprocals is 1.at n=16A379335