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 A201948 #13 Mar 23 2020 17:32:07 %S A201948 0,1,9,10,81,244,729,5104,6561,98416,413344,1476225,9034497,24977728, %T A201948 263063296,349156737,2711943424,8308017153,96467701761,101891588608, %U A201948 1286623443969,2283843782656,30847581595648,33420828483585,352189631991808,804641749434369 %N A201948 Automorphic numbers: n^2 ends with n in base 18 (written in base 10). %H A201948 Eric M. Schmidt, <a href="/A201948/b201948.txt">Table of n, a(n) for n = 1..1000</a> %e A201948 a(3) = 9 = (9)_18 since 9^2 = 81 = (49)_18 ends with 9 in base 18. %e A201948 a(4) = 10 = (A)_18 since 10^2 = 100 = (5A)_18 ends with A in base 18. %e A201948 a(5) = 81 = (49)_18 since 81^2 = 6561 = (1249)_18 ends with 49 in base 18. %o A201948 (Sage) # See A003226. - _Eric M. Schmidt_, Feb 09 2014 %Y A201948 Cf. A003226, A201821, A201918, A201919, A201921, A237583. %K A201948 nonn,base %O A201948 1,3 %A A201948 _Martin Renner_, Dec 06 2011 %E A201948 More terms from _Eric M. Schmidt_, Feb 09 2014