2663428domain: NAppears in sequencesG.f.: Product_{n>=1} (1 - A002203(n)*x^n + (-x^2)^n) / (1 + A002203(n)*x^n + (-x^2)^n) where A002203(n) is the companion Pell numbers.at n=16A204384Number of length n+2 0..3 arrays with no pair in any consecutive three terms totalling exactly 3.at n=13A245990