CONTENTS 1. Introduction..............................................................5 2. The matrix recursion................................................8 3. The characteristic polynomial of A.........................12 4. The autocorrelation tree........................................15 5. The roots of the period polynomials.......................19 6. A recurrence relation for $s_p(x)$..........................25 7. An explicit formula..................................................30 8. The limit function....................................................34 9. The case P = 111...................................................42 10. The exceptional cases.........................................45 11. The structure of the autocorrelation tree..............51 Appendix....................................................................58 References................................................................59
Department of Mathematics, Wellesley College, Wellesley, MA 02181, U.S.A.
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