A049071 - OEIS

A049071

Expansion of x*(3-2*x)/(1-x^2).

0, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3, -2, 3

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..79.

B. R. Myers, On Spanning Trees, Weighted Compositions, Fibonacci Numbers, and Resistor Networks, SIAM Rev., 17 (1975), 465-474.

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

FORMULA

a(n) = (1-5*(-1)^n)/2 for n>0. - Colin Barker, Jun 09 2015

a(n) = a(n-2) for n>2. - Colin Barker, Jun 09 2015

MATHEMATICA

CoefficientList[Series[x (3-2x)/(1-x^2), {x, 0, 150}], x] (* Harvey P. Dale, Mar 23 2011 *)