0,2

Row sums of the triangle in A083093. - Reinhard Zumkeller, Jul 11 2013

Reinhard Zumkeller, Table of n, a(n) for n = 0..6561=3^8

Michael Gilleland, Some Self-Similar Integer Sequences

A. Granville, Binomials modulo a prime

Write n in base 3; if the representation contains r 1's and s 2's then a(n) = 2^{r-1} * (3^(s+1) - 1) = 1/2 * (3*A006047(n) - 2^(A062756(n))). - Robin Chapman, Ahmed Fares (ahmedfares(AT)my-deja.com) and others, Jul 16 2001

(Haskell)

a051638 = sum . a083093_row -- Reinhard Zumkeller, Jul 11 2013

Cf. A001316.

Sequence in context: A318768 A166242 A143107 * A286580 A286598 A286557

Adjacent sequences: A051635 A051636 A051637 * A051639 A051640 A051641

nonn

N. J. A. Sloane

approved