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A202337 Range of A062723. 3
1, 2, 6, 12, 36, 108, 324, 972, 2916, 8748, 26244, 78732, 236196, 708588, 2125764, 6377292, 19131876, 57395628, 172186884, 516560652, 1549681956, 4649045868, 13947137604, 41841412812, 125524238436, 376572715308, 1129718145924, 3389154437772, 10167463313316 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Subsequence of A000792.

Apparently a(n) = A052156(n - 1) for n >= 4. - Georg Fischer, Mar 26 2019

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..1000

FORMULA

Conjectures from Colin Barker, Mar 26 2019: (Start)

G.f.: x*(1 - x - 6*x^3) / (1 - 3*x).

a(n) = 4*3^(n-3) for n>3.

a(n) = 3*a(n-1) for n>4.

(End)

PROG

(Haskell)

a202337 n = a202337_list !! (n-1)

a202337_list = f a062723_list where

   f (x:xs'@(x':xs)) = if x == x' then f xs' else x : f xs'

CROSSREFS

Cf. A000792, A003946, A027327, A025579, A052156, A062723.

Sequence in context: A026549 A120766 A121404 * A189854 A189565 A074442

Adjacent sequences:  A202334 A202335 A202336 * A202338 A202339 A202340

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Dec 17 2011

STATUS

approved

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Last modified June 14 05:10 EDT 2021. Contains 345018 sequences. (Running on oeis4.)