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A328334 Forward difference of difference between 2^n and the next smaller power of 3. 1
1, 0, 4, 2, -2, 32, 10, -34, 256, 26, 1024, 590, -278, 8192, 3262, -6598, 65536, 12974, 262144, 169994, -14306, 2097152, 1005658, -1177330, 16777216, 4856618, -18984578, 134217728, 10155130, 536870912, 298900846, -177039286, 4294967296, 1616365790, -3740837222 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

a(n) is even for n >= 1.

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..3323

FORMULA

a(n) = A063005(n+1) - A063005(n).

MAPLE

b:= proc(n) option remember; (t-> t-3^ilog[3](t))(2^n) end:

a:= n-> b(n+1)-b(n):

seq(a(n), n=0..40);

CROSSREFS

Cf. A063005.

Sequence in context: A199221 A096870 A261253 * A134977 A199081 A232462

Adjacent sequences:  A328331 A328332 A328333 * A328335 A328336 A328337

KEYWORD

sign

AUTHOR

Alois P. Heinz, Oct 12 2019

STATUS

approved

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Last modified July 10 15:45 EDT 2020. Contains 335577 sequences. (Running on oeis4.)