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 A138895 #12 Jul 29 2023 03:01:39 %S A138895 1,2,1,4,2,1,8,4,2,1,5,8,4,2,1,3,5,8,4,2,1,6,3,5,8,4,2,1,12,6,3,5,8,4, %T A138895 2,1,24,12,6,3,5,8,4,2,1,17,24,12,6,3,5,8,4,2,1,11,17,24,12,6,3,5,8,4, %U A138895 2,1 %N A138895 Triangle read by rows: T(n,k) = A092892(n-k) for 0 <= k <= n. %C A138895 Matrix in Toeplitz form related to the Collatz (3x + 1) algorithm. %C A138895 Row sums are A138847. Antidiagonal sums are A138848. %e A138895 Triangle begins %e A138895 1; %e A138895 2, 1; %e A138895 4, 2, 1; %e A138895 8, 4, 2, 1; %e A138895 5, 8, 4, 2, 1; %e A138895 3, 5, 8, 4, 2, 1; %e A138895 6, 3, 5, 8, 4, 2, 1; %e A138895 12, 6, 3, 5, 8, 4, 2, 1; %e A138895 24, 12, 6, 3, 5, 8, 4, 2, 1; %e A138895 17, 24, 12, 6, 3, 5, 8, 4, 2, 1; %e A138895 11, 17, 24, 12, 6, 3, 5, 8, 4, 2, 1; %e A138895 ... %Y A138895 Cf. A092892 (1st column), A138847, A138848. %K A138895 easy,nonn,tabl %O A138895 0,2 %A A138895 _Paul Barry_, Apr 02 2008 %E A138895 Edited by _Georg Fischer_, Jul 28 2023