467078547domain: NAppears in sequencesIrregular triangular array, read by rows: row n shows the coefficients of the polynomial p(n,x) defined in Comments.at n=20A329433a(n) = a(n-1)^2 + 3 for n >=2 , where a(0) = 1, a(1) = 3.at n=5A329471