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 A278564 Irregular triangle read by rows: row n lists (negated) determinants of the quadratic Farey series of order n. 0
 1, 1, 3, 1, 1, 2, 3, 2, 1, 1, 2, 3, 1, 5, 1, 3, 2, 1, 1, 2, 2, 3, 2, 5, 2, 3, 2, 2, 1, 1, 2, 2, 3, 1, 4, 2, 1, 7, 1, 2, 4, 1, 3, 2, 2, 1, 1, 2, 2, 2, 3, 1, 5, 1, 2, 1, 7, 1, 2, 1, 5, 1, 3, 2, 2, 2, 1, 1, 2, 2, 2, 3, 1, 4, 2, 5, 2, 3, 1, 1, 9, 1, 1, 3, 2, 5, 2, 4, 1, 3, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 1, 4, 2, 1, 6, 2, 3, 2, 1, 9, 1, 2, 3, 2, 6, 1, 1, 2, 4, 1, 3, 2, 2, 2, 2, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,3 LINKS Table of n, a(n) for n=2..127. H. Brown, K. Mahler, A generalization of Farey sequences: Some exploration via the computer, Journal of Number Theory 3.3 (1971): 364-370. EXAMPLE Triangle begins: 1, 1,3,1, 1,2,3,2,1, 1,2,3,1,5,1,3,2,1, 1,2,2,3,2,5,2,3,2,2,1, 1,2,2,3,1,4,2,1,7,1,2,4,1,3,2,2,1, 1,2,2,2,3,1,5,1,2,1,7,1,2,1,5,1,3,2,2,2,1, 1,2,2,2,3,1,4,2,5,2,3,1,1,9,1,1,3,2,5,2,4,1,3,1,1,1,1, 1,2,2,2,2,3,1,4,2,1,6,2,3,2,1,9,1,2,3,2,6,1,1,2,4,1,3,2,2,2,2,1, ... CROSSREFS Sequence in context: A243925 A348282 A030727 * A269973 A128316 A065836 Adjacent sequences: A278561 A278562 A278563 * A278565 A278566 A278567 KEYWORD nonn,tabf AUTHOR N. J. A. Sloane, Nov 25 2016 STATUS approved

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Last modified April 22 01:34 EDT 2024. Contains 371887 sequences. (Running on oeis4.)