A160798 - OEIS

%I #13 Mar 15 2020 13:37:19

%S 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 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 63,27,189,27,189,81,567,1,7,3,21,3,21,9,63,3,21,9,63

%N a(n) = A160797(n+2)/3.

%C From _Omar E. Pol_, Mar 15 2020: (Start)

%C It appears that the right border of triangle gives A005032.

%C It appears that the sum of n-th row equals A004171(n). (End)

%e From _Omar E. Pol_, Mar 15 2020: (Start)

%e Written as an irregular triangle in which row lengths are the even powers of 2, the sequence begins:

%e 1, 7;

%e 1, 7, 3, 21;

%e 1, 7, 3, 21, 3, 21, 9, 63;

%e 1, 7, 3, 21, 3, 21, 9, 63, 3, 21, 9, 63, 9, 63, 27, 189;

%e 1, 7, 3, 21, 3, 21, 9, 63, 3, 21, 9, 63, 9, 63, 27, 189, 3, 21, 9, 63, 9, 63, ...

%e (End)

%Y Cf. A004171, A005032, A160796, A160797.

%K nonn,tabf

%O 1,2

%A _Omar E. Pol_, Jun 13 2009

%E More terms from _Jinyuan Wang_, Mar 15 2020