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A097335 Sum k=0..n, C(n-k, floor(k/2))3^k. 2
1, 4, 4, 13, 49, 85, 202, 643, 1408, 3226, 9013, 21685, 50719, 131836, 327001, 783472, 1969996, 4913005, 11964253, 29694217, 73911262, 181589539, 448837492, 1114038850, 2748344701, 6787882129, 16814231779, 41549334088, 102640273249 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..28.

Index entries for linear recurrences with constant coefficients, signature (1,0,9)

FORMULA

G.f. : (1+3x)/(1-x-9x^3); a(n)=a(n-1)+9a(n-3).

CROSSREFS

Cf. A097333, A097334, A097336.

Sequence in context: A219454 A059443 A241250 * A255297 A263870 A263796

Adjacent sequences:  A097332 A097333 A097334 * A097336 A097337 A097338

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Aug 05 2004

STATUS

approved

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Last modified March 19 17:21 EDT 2019. Contains 321330 sequences. (Running on oeis4.)