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 A167366 #4 Apr 05 2012 17:07:21 %S A167366 1,3,1,2,1,1,2,2,3,1,2,0,0,1,1,2,2,0,0,3,1,2,0,2,0,2,1,1,2,2,2,2,2,2, %T A167366 3,1,2,0,0,0,0,0,0,1,1,2,2,0,0,0,0,0,0,3,1,2,0,2,0,0,0,0,0,2,1,1,2,2, %U A167366 2,2,0,0,0,0,2,2,3,1,2,0,0,0,2,0,0,0,2,0,0,1,1 %N A167366 Triangle read by rows, 2*A047999 - A097806 (signed) = twice Sierpinski's gasket - the signed pair sum operator. %C A167366 Row sums = A167275: (1, 4, 4, 8, 4, 8, 8, 16,...). %F A167366 Triangle read by rows, 2*A047999 - A096806, the pair sum operator. %F A167366 A096806 is signed, rightmost diagonal = (+,+,+,...); adjacent diagonal is %F A167366 signed (-,-,-,...). %e A167366 First few rows of the triangle = %e A167366 1; %e A167366 3, 1; %e A167366 2, 1, 1; %e A167366 2, 2, 3, 1; %e A167366 2, 0, 0, 1, 1; %e A167366 2, 2, 0, 0, 3, 1; %e A167366 2, 0, 2, 0, 2, 1, 1; %e A167366 2, 2, 2, 2, 2, 2, 3, 1; %e A167366 2, 0, 0, 0, 0, 0, 0, 1, 1; %e A167366 2, 2, 0, 0, 0, 0, 0, 0, 3, 1; %e A167366 2, 0, 2, 0, 0, 0, 0, 0, 2, 1, 1; %e A167366 2, 2, 2, 2, 0, 0, 0, 0, 2, 2, 3, 1; %e A167366 2, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 1, 1; %e A167366 2, 2, 0, 0, 2, 2, 0, 0, 2, 2, 0, 0, 3, 1; %e A167366 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 1, 1; %e A167366 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 1; %e A167366 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1; %e A167366 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 1; %e A167366 2, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 1, 1; %e A167366 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 3, 1; %e A167366 ... %Y A167366 Cf. A047999, A097806 %K A167366 nonn,tabl %O A167366 0,2 %A A167366 _Gary W. Adamson_ & _Mats Granvik_, Nov 01 2009