d3x/dt3 + A d2x/dt2 - (dx/dt)2 + x = 0

dx/dt = y

dy/dt = z

dz/dt = -x + y2 - A z

parameters: A =2.017
The step size of the fourth-order Runge-Kutta method: 0.001

Lyapunov exponents (log with base-e): 0.0551, -0.0000, -2.0721

Lyapunov dimension: 2.0266

The sum of the Lyapunov exponents  is theoretically the same as -A.

Reference

Simplest dissipative chaotic flow

Julien Clinton Sprott

Physics Letters A, Volume 228, pp. 271-274, 1997

DOI: 10.1016/S0375-9601(97)00088-1

Chaos and Time-Series Analysis (p. 437)

Julien Clinton Sprott

Oxford University Press (2001/Sep/27)

ISBN-10: 0198508409

ISBN-13: 978-0198508403

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