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A201967 Expansion of 1/(1-2*x-3*x^2+x^4) in powers of x. 1
1, 2, 7, 20, 60, 178, 529, 1572, 4671, 13880, 41244, 122556, 364173, 1082134, 3215543, 9554932, 28392320, 84367302, 250696021, 744939016, 2213573775, 6577597296, 19545219896, 58078292664, 172578671241, 512814623178 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..25.

Index entries for linear recurrences with constant coefficients, signature (2,3,0,-1).

FORMULA

a(n)= 2*a(n-1) + 3*a(n-2) - a(n-4), a(0)=1, a(n)=0 if n<0.

CROSSREFS

Sequence in context: A026124 A026153 A025180 * A116950 A111017 A116408

Adjacent sequences:  A201964 A201965 A201966 * A201968 A201969 A201970

KEYWORD

easy,nonn

AUTHOR

Philippe Deléham, Dec 07 2011

STATUS

approved

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Last modified September 18 13:59 EDT 2020. Contains 337169 sequences. (Running on oeis4.)