72657domain: NAppears in sequences[ 3rd elementary symmetric function of {sqrt(k+1)} ], k = 1,2,...,n.at n=20A025220a(n) = Sum_{k=1..n} A153757(k).at n=7A153758100-gonal numbers: a(n) = 98*n*(n-1)/2 + n.at n=39A261276G.f. A(x) satisfies A(x) = 1 + x*(1+x^2)^3*A(x)^3.at n=8A385317