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A037681 Base-4 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,3,2. 0
1, 4, 19, 78, 313, 1252, 5011, 20046, 80185, 320740, 1282963, 5131854, 20527417, 82109668, 328438675, 1313754702, 5255018809, 21020075236, 84080300947, 336321203790, 1345284815161, 5381139260644, 21524557042579, 86098228170318 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..24.

Index entries for linear recurrences with constant coefficients, signature (4,0,0,1,-4).

FORMULA

G.f.: x*(1+3*x^2+2*x^3) / ( (x-1)*(4*x-1)*(1+x)*(x^2+1) ). - R. J. Mathar, May 04 2015

CROSSREFS

Sequence in context: A094578 A130132 A037590 * A156760 A320088 A122909

Adjacent sequences:  A037678 A037679 A037680 * A037682 A037683 A037684

KEYWORD

nonn,base,easy

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified September 19 03:31 EDT 2021. Contains 347550 sequences. (Running on oeis4.)