34132685120domain: NAppears in sequencesSolution to the Dancing School Problem with 12 girls and n+12 boys: f(12,n).at n=10A079917Number of bounded regions in the Linial arrangement L_{n-1}.at n=12A283828E.g.f. satisfies: A(x) = exp( x * (1 + 1/A(x))/2 ).at n=13A349719