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 A191820 #14 Mar 31 2012 13:22:30 %S A191820 1371742,1371743,1371752,1371754,1371763,1371764,1371842,1371843, %T A191820 1371862,1371865,1371873,1371875,1371952,1371954,1371962,1371965, %U A191820 1371984,1371985,1372063,1372064,1372073,1372075,1372084,1372085,1372742,1372743,1372752 %N A191820 A178478(n)/9. %C A191820 There are 8!=40320 terms in this finite sequence. Its origin is the fact that numbers whose decimal expansion is a permutation of 12345678 are all divisible by 9. %H A191820 Nathaniel Johnston, <a href="/A191820/b191820.txt">Table of n, a(n) for n = 1..10000</a> %Y A191820 Cf. A178485, A178486, A191819. %K A191820 nonn,fini,easy,base %O A191820 1,1 %A A191820 _Nathaniel Johnston_, Jun 24 2011