3910797436domain: NAppears in sequencesa(n) = binomial(3*n, n - 1).at n=12A004319Binomial coefficient C(39,n).at n=12A010955a(n) = binomial(n,12).at n=27A010965a(n) = binomial(n,27).at n=12A010980a(n) = binomial(floor((3n+4)/2),floor(n/2)).at n=25A127040a(n) = Sum_{j=1..floor(n/2)} binomial(n+j-1,j-1).at n=25A175167