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 A160798 #15 May 30 2025 15:10:28 %S A160798 1,7,1,7,3,21,1,7,3,21,3,21,9,63,1,7,3,21,3,21,9,63,3,21,9,63,9,63,27, %T A160798 189,1,7,3,21,3,21,9,63,3,21,9,63,9,63,27,189,3,21,9,63,9,63,27,189,9, %U A160798 63,27,189,27,189,81,567,1,7,3,21,3,21,9,63,3,21,9,63 %N A160798 a(n) = A160797(n+2)/3. %C A160798 From _Omar E. Pol_, Mar 15 2020: (Start) %C A160798 It appears that the right border of triangle gives A005032. %C A160798 It appears that the sum of n-th row equals A004171(n). (End) %C A160798 Apparently A160417 shifted once left. - _R. J. Mathar_, May 30 2025 %e A160798 From _Omar E. Pol_, Mar 15 2020: (Start) %e A160798 Written as an irregular triangle in which row lengths are the even powers of 2, the sequence begins: %e A160798 1, 7; %e A160798 1, 7, 3, 21; %e A160798 1, 7, 3, 21, 3, 21, 9, 63; %e A160798 1, 7, 3, 21, 3, 21, 9, 63, 3, 21, 9, 63, 9, 63, 27, 189; %e A160798 1, 7, 3, 21, 3, 21, 9, 63, 3, 21, 9, 63, 9, 63, 27, 189, 3, 21, 9, 63, 9, 63, ... %e A160798 (End) %Y A160798 Cf. A004171, A005032, A160796, A160797. %K A160798 nonn,tabf %O A160798 1,2 %A A160798 _Omar E. Pol_, Jun 13 2009 %E A160798 More terms from _Jinyuan Wang_, Mar 15 2020