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A280756 Expansion of (1 + 2*x)/(1 - x - 4*x^2 + x^4). 0
1, 3, 7, 19, 46, 119, 296, 753, 1891, 4784, 12052, 30435, 76752, 193708, 488664, 1233061, 3110965, 7849501, 19804697, 49969640, 126077463, 318106522, 802611677, 2025068125, 5109437370, 12891603348, 32526741151, 82068086418, 207065613652, 522446355976, 1318182069433, 3325899406919 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..31.

R. Sachdeva and A. K. Agarwal, Combinatorics of certain restricted n-color composition functions, Discrete Mathematics, 340, (2017), 361-372. See sequence C_5.

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

CROSSREFS

Sequence in context: A274596 A185696 A141344 * A029855 A209397 A110014

Adjacent sequences:  A280753 A280754 A280755 * A280757 A280758 A280759

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Jan 16 2017

STATUS

approved

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Last modified August 18 08:39 EDT 2018. Contains 313823 sequences. (Running on oeis4.)