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Hankel matrices are square matrices whose coefficients $a_{i,j}$ only depend on the sum $i+j$. They appear in particular in the theory of orthogonal polynomials on the real line.

4 votes

A continued J fraction for $a_n = \frac{1}{(n+1)^2}$?

Sagemath can do that too sage: x = PowerSeriesRing(QQ,'x').gen() sage: f = sum(x**n/(n+1)**2 for n in range(20)).O(20) sage: f.jacobi_continued_fraction() ((-1/4, -7/144), (-13/28, -647/110 …
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