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A022015 a(n)=2a(n-1)+3a(n-2)+2a(n-3)+3a(n-4). 1
2, 6, 19, 61, 197, 633, 2036, 6548, 21061, 67737, 217861, 700699, 2253638, 7248306, 23312507, 74979305, 241153657, 775615161, 2494587424, 8023265560, 25804984685, 82995786381, 266936820209, 858540765611 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (2,3,2,3).

FORMULA

G.f.: -(((1+x)*(2+x^2))/(-1+x(2+3*x)*(1+x^2))). - Harvey P. Dale, May 04 2015

MATHEMATICA

LinearRecurrence[{2, 3, 2, 3}, {2, 6, 19, 61}, 30] (* Harvey P. Dale, May 04 2015 *)

CROSSREFS

Sequence in context: A022041 A018906 A014010 * A138747 A052975 A275943

Adjacent sequences:  A022012 A022013 A022014 * A022016 A022017 A022018

KEYWORD

nonn

AUTHOR

R. K. Guy

STATUS

approved

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Last modified October 21 22:47 EDT 2019. Contains 328315 sequences. (Running on oeis4.)