This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A374573 #8 Jul 12 2024 21:16:09
%S A374573 1,2,8,109,11087,15312665,422059040480,312210595377427422,
%T A374573 7962423724145466121172404,8668986293188852191645897272339367
%N A374573 Number of sets of nonempty subsets of [n] where each element appears in at most n subsets.
%F A374573 a(n) = A330964(n,n).
%e A374573 a(0) = 1: {}.
%e A374573 a(1) = 2: {}, {{1}}.
%e A374573 a(2) = 8: {}, {{1}}, {{2}}, {{1,2}}, {{1},{2}}, {{1},{1,2}}, {{2},{1,2}}, {{1},{2},{1,2}}.
%Y A374573 Main diagonal of A330964.
%K A374573 nonn,more
%O A374573 0,2
%A A374573 _Alois P. Heinz_, Jul 11 2024