11685817domain: NAppears in sequencesa(n) = (3n)!/(n!(n+1)!(n+2)!).at n=5A161581Irregular triangle read by rows giving the denominators of the coefficients of the Eisenstein series G_{2*n} multiplied by 2*n-1, for n >= 2. Also Laurent coefficients of Weierstrass's P function.at n=18A274343