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 A093472 #8 Oct 03 2013 09:31:24 %S A093472 159,258,357,456,555,654,753,852,951,11599,12589,13579,14569,15559, %T A093472 16549,17539,18529,19519,21598,22588,23578,24568,25558,26548,27538, %U A093472 28528,29518,31597,32587,33577,34567,35557,36547,37537,38527,39517 %N A093472 (2n+1)-digit anti-palindromic numbers or numberdromes, whose first and last digits add to ten, second and next-to-last add to ten and so on with the central digit a 5. %F A093472 a(n) = (10^(m+1))n+5(10^m)+(10^m-n) %e A093472 a(1) = 159 because at least three digits are required, so that n = 1, m = 1 yields a(1) = 100+50+(10-1) = 159 %Y A093472 Cf. A083678. %K A093472 easy,nonn,base %O A093472 0,1 %A A093472 _Michael Joseph Halm_, May 13 2004