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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) A306839 Number of unimodular n X n matrices with elements {-1, 0, 1}. 1 2, 40, 6960, 10340736, 129599358720, 13527918439695360 (list; graph; refs; listen; history; text; internal format) OFFSET 1,1 LINKS Table of n, a(n) for n=1..6. S. E. Thornton, Properties of the Bohemian family of n x n matrices with population {-1, 0, 1}, Characteristic Polynomial Database. Minfeng Wang, C++ program to calculate A306839 CROSSREFS Sequence in context: A328553 A162868 A059476 * A297385 A261429 A062769 Adjacent sequences: A306836 A306837 A306838 * A306840 A306841 A306842 KEYWORD nonn,more,hard AUTHOR Steven E. Thornton, Mar 12 2019 EXTENSIONS a(1)-a(5) confirmed and a(6) added by Minfeng Wang, May 01 2024 STATUS approved

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Last modified August 1 02:20 EDT 2024. Contains 374809 sequences. (Running on oeis4.)