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A168236 3*n/2-1/4-3*(-1)^n/4 1
2, 2, 5, 5, 8, 8, 11, 11, 14, 14, 17, 17, 20, 20, 23, 23, 26, 26, 29, 29, 32, 32, 35, 35, 38, 38, 41, 41, 44, 44, 47, 47, 50, 50, 53, 53, 56, 56, 59, 59, 62, 62, 65, 65, 68, 68, 71, 71, 74, 74, 77, 77, 80, 80, 83, 83, 86, 86, 89, 89, 92, 92, 95, 95, 98, 98, 101, 101, 104, 104 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..70.

Index to sequences with linear recurrences with constant coefficients, signature (1,1,-1).

FORMULA

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

a(n+1) = A016789(floor(n/2)).

CROSSREFS

Sequence in context: A213032 A167177 A145061 * A035624 A073707 A091609

Adjacent sequences:  A168233 A168234 A168235 * A168237 A168238 A168239

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Nov 21 2009

STATUS

approved

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Last modified May 23 17:52 EDT 2013. Contains 225611 sequences.