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 A174064 #11 Feb 21 2024 08:19:23 %S A174064 1,2,1,2,0,4,2,2,1,4,0,2,2,4,1,0,0,8,0,0,1,4,2,0,2,2,0,4,0,4,1,2,2,0, %T A174064 2,4,0,4,0,0,0,8,0,2,1,0,4,4,2,0,0,2,0,8,0,4,0,0,1,0,4,8,2,0,0,0,0,0, %U A174064 0,16,0,0,2,0,0,0,2,8,4,0,1,4,0,0,0,4,0,8,0,2,2,4,0,0,2,4,4,0,1,2,0,8,0,0,0 %N A174064 Irregular triangle, row sums = n. %C A174064 Column 1 = A174026. %C A174064 The triangle begins 1, 2,...then all columns >1 are shifted down twice from previous column. Next term in column 1 = n - (sum of terms in n-th row, columns >1). Terms of the triangle for columns >1 are filled in as a product of column 1 * column 1. %e A174064 Triangle begins: %e A174064 1; %e A174064 2; %e A174064 1, 2; %e A174064 0, 4; %e A174064 2, 2, 1; %e A174064 4, 0, 2; %e A174064 2, 4, 1, 0; %e A174064 0, 8, 0, 0; %e A174064 1, 4, 2, 0, 2; %e A174064 2, 0, 4, 0, 4; %e A174064 1, 2, 2, 0, 2, 4; %e A174064 0, 4, 0, 0, 0, 8; %e A174064 0, 2, 1, 0, 4, 4, 2; %e A174064 0, 0, 2, 0, 8, 0, 4; %e A174064 0, 0, 1, 0, 4, 8, 2, 0; %e A174064 0, 0, 0, 0, 0, 16, 0, 0; %e A174064 2, 0, 0, 0, 2, 8, 4, 0, 1; %e A174064 4, 0, 0, 0, 4, 0, 8, 0, 2; %e A174064 2, 4, 0, 0, 2, 4, 4, 0, 1, 2; %e A174064 0, 8, 0, 0, 0, 8, 0, 0, 0, 4; %e A174064 ... %e A174064 Example: Leftmost term in column 9 = 1 = (9 - (4 + 2 + 0 + 2)). Then the "1" is entered into the top heading as a multiplier. Multiply, filling in more terms, then obtain next term of left border as before. %Y A174064 Cf. A174026, A174064. %K A174064 nonn,tabf,uned %O A174064 1,2 %A A174064 _Gary W. Adamson_, Mar 06 2010