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A060827 3-wave sequence beginning with 2's. 0
2, 2, 2, 4, 6, 10, 12, 22, 28, 50, 62, 112, 140, 252, 314, 566, 706, 1272, 1586, 2858, 3564, 6422, 8008, 14430, 17994, 32424, 40432, 72856, 90850, 163706, 204138, 367844, 458694, 826538, 1030676, 1857214, 2315908, 4173122, 5203798, 9376920 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

The 3-wave sequence with initial values a, b, c is formed by the following construction:

a.......a+b+c............3a+5b+6c...

..b...b+c...a+2b+2c..2a+4b+5c...

....c..........a+2b+3c...

Dropping middle row gives A052994.

LINKS

Table of n, a(n) for n=0..39.

F. v. Lamoen, Wave sequences

Index entries for linear recurrences with constant coefficients, signature (0,2,0,1,0,-1).

FORMULA

G.f.: (-2x^2+2x+2)/(x^6-x^4-2x^2+1).

a(n) = 2*A038196(n).

CROSSREFS

Cf. A038196, A052994 (bisection)

Sequence in context: A272371 A191651 A010558 * A188288 A064355 A000799

Adjacent sequences:  A060824 A060825 A060826 * A060828 A060829 A060830

KEYWORD

easy,nonn

AUTHOR

Jason Earls, Apr 30 2001

EXTENSIONS

More terms from Larry Reeves (larryr(AT)acm.org), May 10 2001

STATUS

approved

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Last modified November 14 12:21 EST 2019. Contains 329114 sequences. (Running on oeis4.)