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 A137710 #10 Mar 30 2024 23:09:10 %S A137710 1,2,1,4,1,1,8,2,1,1,16,4,2,1,1,32,8,3,2,1,1,64,16,6,2,2,1,1,64,16,6, %T A137710 2,2,1,1,128,32,12,5,2,2,1,1,256,64,24,10,4,2,2,1,1,512,128,48,21,9,4, %U A137710 2,2,1,1,1024,256,96,42,19,18,4,2,2,1,1,2048,512,192,84,40,18,18,4,2,2,1,1 %N A137710 Triangle read by rows: T(n,k) = T(n-1, k-1) - T(n-k, k-1); left border = (1, 2, 4, 8, 16, 32, ...). %C A137710 Row sums = A137711: (1, 3, 6, 12, 24, 47, 92, 183, ...). %C A137710 Eigensequence of the triangle = even-indexed Fibonacci numbers starting (1, 3, 8, 21, 55, ...). Cf. triangle A180339. - _Gary W. Adamson_, Aug 28 2010 %F A137710 The triangle is generated by two rules: T(n,k) = T(n-1, k-1) - T(n-k, k-1); and left border = 1, 2, 4, 8, 16, ... %e A137710 First few rows of the triangle: %e A137710 1; %e A137710 2, 1; %e A137710 4, 1, 1; %e A137710 8, 2, 1, 1; %e A137710 16, 4, 2, 1, 1; %e A137710 32, 8, 3, 2, 1, 1; %e A137710 64, 16, 6, 2, 2, 1, 1; %e A137710 128, 32, 12, 5, 2, 2, 1, 1; %e A137710 256, 64, 24, 10, 4, 2, 2, 1, 1; %e A137710 512, 128, 48, 21, 9, 4, 2, 2, 1, 1; %e A137710 ... %Y A137710 Cf. A137711. %Y A137710 Cf. A180339. - _Gary W. Adamson_, Aug 28 2010 %K A137710 nonn,tabl %O A137710 1,2 %A A137710 _Gary W. Adamson_, Feb 08 2008