A131731 - OEIS

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A131731

Period 4: repeat [2, -3, 4, -3].

2, -3, 4, -3, 2, -3, 4, -3, 2, -3, 4, -3, 2, -3, 4, -3, 2, -3, 4, -3, 2, -3, 4, -3, 2, -3, 4, -3, 2, -3, 4, -3, 2, -3, 4, -3, 2, -3, 4, -3, 2, -3, 4, -3, 2, -3, 4, -3, 2, -3, 4, -3, 2, -3, 4, -3, 2, -3, 4, -3, 2, -3, 4, -3, 2, -3, 4, -3, 2, -3, 4, -3, 2, -3, 4, -3, 2, -3, 4, -3, 2, -3, 4, -3, 2, -3, 4, -3, 2, -3, 4, -3

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OFFSET

0,1

LINKS

Table of n, a(n) for n=0..91.

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

FORMULA

From Luce ETIENNE, Mar 25 2017: (Start)

a(n)= (6*(-1)^n-(-1)^((2*n+1-(-1)^n)/4)-(-1)^((2*n-1+(-1)^n)/4))/2.

a(n) = 3*cos(n*Pi)-cos(n*Pi/2). (End)

CROSSREFS

Sequence in context: A371769 A343435 A211010 * A255480 A356014 A309859