416012domain: NAppears in sequencesa(n) = 2*binomial(2*n,n)/(n+1) - n.at n=11A132788Irregular triangle read by rows, giving the numerators 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=25A274342