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 A151982 #3 Nov 03 2016 06:16:31 %S A151982 1,1,1,1,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,5,5,5,5,5,5,5,5,5,5,5,5,8,8,8, %T A151982 8,8,8,8,8,8,8,8,8,8,8,8,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13, %U A151982 13,13,13 %N A151982 Arrangement of Fibonacci-numbers in a centered triangular fashion, such that every number is the difference and/or sum of adjacent numbers. %e A151982 ............5 %e A151982 .........5.3. %e A151982 ......5.3.2.5 %e A151982 ...5.3.2.1.3. %e A151982 5.3.2.1.1.2.5 %e A151982 ...5.3.2.1.3. %e A151982 ......5.3.2.5 %e A151982 .........5.3. %e A151982 ............5 %Y A151982 Cf. A131410. %K A151982 nonn %O A151982 1,5 %A A151982 _Mark Dols_, Jul 21 2009