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 A127872 #14 Jan 23 2023 12:05:32 %S A127872 1,1,1,0,1,1,1,1,1,1,0,0,0,1,1,0,0,1,1,1,1,0,1,1,0,0,1,1,1,1,1,1,1,1, %T A127872 1,1,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,1,1,0,0,1,1,0,0, %U A127872 0,0,1,1,1,1,1,1,1,1,0,0,0,1,1,0,0,0,0,0,0,1,1,0,0,1,1,1,1,0,0,0,0,1,1,1,1 %N A127872 Triangle formed by reading A039599 mod 2. %C A127872 Also triangle formed by reading triangles A061554, A106180, A110519, A124574, A124576, A126953, A127543 modulo 2. %H A127872 G. C. Greubel, <a href="/A127872/b127872.txt">Table of n, a(n) for the first 50 rows, flattened</a> %F A127872 Sum_{k=0..n} T(n,k)*x^k = A000007(n), A036987(n), A001316(n), A062878(n) for x=-1,0,1,2 respectively. %F A127872 Sum_{k=0..n} T(n,k)*Fibonacci(2*k+1) = A050614(n), see A000045 and A001519. - _Philippe Deléham_, Aug 30 2007 %e A127872 Triangle begins: %e A127872 1; %e A127872 1, 1; %e A127872 0, 1, 1; %e A127872 1, 1, 1, 1; %e A127872 0, 0, 0, 1, 1; %e A127872 0, 0, 1, 1, 1, 1; %e A127872 0, 1, 1, 0, 0, 1, 1; %e A127872 1, 1, 1, 1, 1, 1, 1, 1; %e A127872 0, 0, 0, 0, 0, 0, 0, 1, 1; %e A127872 0, 0, 0, 0, 0, 0, 1, 1, 1, 1; %e A127872 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 1; %e A127872 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1; %e A127872 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1; %e A127872 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1; %e A127872 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1; %e A127872 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1; ... %t A127872 T[0, 0] := 1; T[n_, k_] := Binomial[2*n - 1, n - k] - Binomial[2*n - 1, n - k - 2]; Table[Mod[T[n, k], 2], {n,0,10}, {k,0,n}] // Flatten (* _G. C. Greubel_, Apr 18 2017 *) %Y A127872 Cf. A061554, A106180, A110519, A124574, A124576, A126953, A127543. %Y A127872 Cf. A000007, A036987, A001316, A062878, A050614, A000045, A001519 %K A127872 nonn,tabl %O A127872 0,1 %A A127872 _Philippe Deléham_, Apr 05 2007