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 A203987 #11 Oct 30 2018 10:31:02 %S A203987 3265920,184320,5820,6480,46080,998,387,171,167 %N A203987 Number of integers m such that both m and n*m are decimal pandigital numbers (A050278). %C A203987 a(1) = 3265920 = 9*9! is trivially the number of all terms in A050278. %Y A203987 Cf. A050278. %K A203987 base,nonn,fini,full %O A203987 1,1 %A A203987 _Zak Seidov_, Jan 09 2012