A162349 First differences of A160412.

3, 9, 9, 27, 9, 27, 27, 81, 9, 27, 27, 81, 27, 81, 81, 243, 9, 27, 27, 81, 27, 81, 81, 243, 27, 81, 81, 243, 81, 243, 243, 729, 9, 27, 27, 81, 27, 81, 81, 243, 27, 81, 81, 243, 81, 243, 243, 729, 27, 81, 81, 243, 81, 243, 243, 729, 81, 243, 243, 729, 243, 729

Offset

1,1

Comments

Note that if A048883 is written as a triangle then rows converge to this sequence. - Omar E. Pol, Nov 15 2009

Links

Table of n, a(n) for n=1..62.

Omar E. Pol, Illustration of initial terms (Neighbors of the vertices).

Formula

a(n) = 3^A063787(n) = 3 * A048883(n-1). - Amiram Eldar, Feb 02 2024

Mathematica

a[n_] := 3^(1 + DigitCount[n - 1, 2, 1]); Array[a, 100] (* Amiram Eldar, Feb 02 2024 *)

Crossrefs

Cf. A063787, A152980, A160410, A160411, A160412, A160414, A160415, A160417, A160797.

Cf. A048883, A161415. - Omar E. Pol, Nov 15 2009

Sequence in context: A207550 A207317 A206700 * A223022 A072404 A222996

Adjacent sequences: A162346 A162347 A162348 * A162350 A162351 A162352

Keyword

nonn

Author

Omar E. Pol, Jul 14 2009

Extensions

More terms from Omar E. Pol, Nov 15 2009

More terms from Colin Barker, Apr 19 2015

More terms from Amiram Eldar, Feb 02 2024

Status

approved