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A029906 Zack's sequence (the pattern is evident). 0
0, 1, 1, 2, 0, 2, 2, 4, 0, 3, 3, 6, 0, 4, 4, 8, 0, 5, 5, 10, 0, 6, 6, 12, 0, 7, 7, 14, 0, 8, 8, 16, 0, 9, 9, 18, 0, 10, 10, 20, 0, 11, 11, 22, 0, 12, 12, 24, 0, 13, 13, 26, 0, 14, 14, 28, 0, 15, 15, 30, 0, 16, 16, 32 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..63.

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

FORMULA

a(n)= +2*a(n-4) -a(n-8). G.f.: x*(1+x+2*x^2) / ( (x-1)^2*(1+x)^2*(x^2+1)^2 ). [From R. J. Mathar, Aug 15 2010]

CROSSREFS

Sequence in context: A078729 A300236 A238158 * A094907 A343401 A226570

Adjacent sequences:  A029903 A029904 A029905 * A029907 A029908 A029909

KEYWORD

nonn,easy

AUTHOR

Amela2(AT)aol.com

STATUS

approved

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Last modified September 25 20:01 EDT 2021. Contains 347659 sequences. (Running on oeis4.)