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 A050756 #10 Oct 27 2019 00:27:13 %S A050756 0,1,512,19683,1953125,40353607,387420489,2357947691,5159780352, %T A050756 68719476736,198359290368,3814697265625,5429503678976,14507145975869, %U A050756 165216101262848,327381934393961,618121839509504,18014398509481984 %N A050756 Ninth powers containing no pair of consecutive equal digits. %t A050756 Select[Range[0,90]^9,FreeQ[Differences[IntegerDigits[#]],0]&] (* _Harvey P. Dale_, Dec 27 2011 *) %Y A050756 Cf. A043096, A001017, A050748. %K A050756 nonn,base %O A050756 0,3 %A A050756 _Patrick De Geest_, Sep 15 1999