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 A163344 #2 Mar 31 2012 13:21:18 %S A163344 0,1,2,11,10,9,18,19,20,101,100,99,90,91,92,83,82,81,162,163,164,173, %T A163344 172,171,180,181,182,911,910,909,900,901,902,893,892,891,810,811,812, %U A163344 821,820,819,828,829,830,749,748,747,738,739,740,731,730,729,1458 %N A163344 Central diagonal of A163334 and A163336 divided by 4. %Y A163344 a(n) = A163343(n)/4. %K A163344 nonn %O A163344 0,3 %A A163344 _Antti Karttunen_, Jul 29 2009