706252528630domain: NAppears in sequencesBinomial coefficient C(5*n,n-9).at n=9A004351Binomial coefficient C(6n,n-6).at n=9A004361Binomial coefficients C(n,81).at n=9A017745Binomial coefficients C(90,n).at n=9A017806a(n) = binomial(n*(n+1), n).at n=9A135860a(n) = binomial(10*n, n).at n=9A169959