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 A193592 #18 Jun 12 2025 21:37:45 %S A193592 1,1,1,1,2,1,1,3,2,1,1,4,3,2,1,1,5,4,3,2,1,1,6,5,4,3,2,1,1,7,6,5,4,3, %T A193592 2,1,1,8,7,6,5,4,3,2,1,1,9,8,7,6,5,4,3,2,1,1,10,9,8,7,6,5,4,3,2,1,1, %U A193592 11,10,9,8,7,6,5,4,3,2,1,1,12,11,10,9,8,7,6,5,4,3,2,1 %N A193592 Triangle read by rows having n-th row 1, n, n-1, n-2,..., 2, 1 for n>=0. %C A193592 The triangle with its first column removed is A004736. - _Hartmut F. W. Hoft_, Jun 05 2017 %e A193592 Triangle begins: %e A193592 1 %e A193592 1 1 %e A193592 1 2 1 %e A193592 1 3 2 1 %e A193592 1 4 3 2 1 %t A193592 a193592[n_] := Map[Prepend[Range[#, 1, -1], 1]&, Range[0, n]] %t A193592 Flatten[a193592[12]] (* data *) %t A193592 TableForm[a193592[4]] (* triangle *) (* _Hartmut F. W. Hoft_, Jun 05 2017 *) %Y A193592 Cf. A193593, A004736. %K A193592 nonn,tabl %O A193592 0,5 %A A193592 _Clark Kimberling_, Jul 31 2011 %E A193592 Corrected and added more terms by _Hartmut F. W. Hoft_, Jun 05 2017