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 A134505 #17 Jun 07 2023 08:50:15 %S A134505 1,1,1,1,1,1,1,2,1,1,1,1,3,1,1,1,3,1,4,1,1,1,1,6,1,5,1,1,1,4,1,10,1,6, %T A134505 1,1,1,1,10,1,15,1,7,1,1,1,5,1,20,1,21,1,8,1,1,1,1,15,1,35,1,28,1,9,1, %U A134505 1,1,6,1,35,1,56,1,36,1,10,1,1 %N A134505 Replace 0's with 1's in triangle A049310, and take absolute values. %C A134505 Row sums = A134506: (1, 2, 3, 5, 7, 11, 16, ...). %e A134505 First few rows of the triangle are: %e A134505 1; %e A134505 1, 1; %e A134505 1, 1, 1; %e A134505 1, 2, 1, 1; %e A134505 1, 1, 3, 1, 1; %e A134505 1, 3, 1, 4, 1, 1; %e A134505 1, 1, 6, 1, 5, 1, 1; %e A134505 1, 4, 1, 10, 1, 6, 1, 1; %e A134505 1, 1, 10, 1, 15, 1, 7, 1, 1; %e A134505 ... %Y A134505 Cf. A049310, A134506. %K A134505 nonn,tabl %O A134505 1,8 %A A134505 _Gary W. Adamson_, Oct 28 2007 %E A134505 Definition corrected by _Eric Rowland_, Jun 23 2017 %E A134505 a(43) = 7 corrected and more terms from _Georg Fischer_, Jun 07 2023