Orangeskid's guess is correct.
For a matrix $(a_{ij})$ (it is convenient to enumerate rows and columns from 0,not from 1) denote $$b_{ij}=\sum_{k, s}{i\choose k}{j\choose s}a_{ks}.$$ This matrix transform corresponds to a left and right multiplicaton by unitriangular matrices, thus it preserves determinant. Now if $a_{ij}=f(i+j)$ is a Hankel matrix, then $$b_{ij}=\sum_t f(t)\sum_{k+s=t} {i\choose k}{j\choose s}=\sum_tf(t){i+j\choose t}$$ is a Hankel matrix corresponding to the binomial transform of $f$.