A160798 a(n) = A160797(n+2)/3.

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

Offset

1,2

Comments

From Omar E. Pol, Mar 15 2020: (Start)

It appears that the right border of triangle gives A005032.

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

Links

Table of n, a(n) for n=1..74.

Example

From Omar E. Pol, Mar 15 2020: (Start)
Written as an irregular triangle in which row lengths are the even powers of 2, the sequence begins:
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, 189;
1, 7, 3, 21, 3, 21, 9, 63, 3, 21, 9, 63, 9, 63, 27, 189, 3, 21, 9, 63, 9, 63, ...
(End)

Crossrefs

Cf. A004171, A005032, A160796, A160797.

Sequence in context: A317846 A198219 A198580 * A033953 A295872 A351835

Adjacent sequences: A160795 A160796 A160797 * A160799 A160800 A160801

Keyword

nonn,tabf

Author

Omar E. Pol, Jun 13 2009

Extensions

More terms from Jinyuan Wang, Mar 15 2020

Status

approved