4395118domain: NAppears in sequencesSeventh column of Catalan triangle A009766.at n=30A064059Number of standard Young tableaux of shape [6n,6].at n=6A215546a(n) = binomial(7*n,n)*(5*n+1)/(6*n+1).at n=6A215551Number of standard Young tableaux of shape [n^2,n].at n=6A215557