308055528domain: NAppears in sequencesSolution to the Dancing School Problem with 10 girls and n+10 boys: f(10,n).at n=9A079915Solution to the Dancing School Problem with n girls and n+9 boys: f(n,9).at n=9A079928E.g.f.: REVERT(2*x/(1+exp(x))) = Sum_{n>=0} a(n)*x^n/n!.at n=11A088789