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 A286297 Irregular triangle read by rows: successive rows have lengths 1,3,5,7,..., and are filled in across rows with the smallest nonnegative number such that there is no repeat in any row, column, or diagonal of slope +-1. 5
 0, 1, 2, 3, 2, 0, 4, 1, 5, 3, 1, 5, 6, 0, 4, 2, 4, 5, 0, 2, 1, 7, 3, 6, 8, 5, 3, 1, 4, 6, 8, 9, 2, 7, 0, 10, 6, 4, 2, 0, 3, 9, 5, 10, 11, 1, 12, 7, 13, 7, 8, 9, 5, 4, 6, 10, 3, 2, 12, 0, 11, 14, 15, 1, 8, 6, 10, 3, 7, 2, 11, 4, 9, 13, 1, 5, 15, 12, 16, 14, 17 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Conjecture: every column or diagonal of slope +-1 is a permutation of the nonnegative numbers. LINKS Alois P. Heinz, Rows n = 0..200, flattened EXAMPLE Triangle begins: ..........0, ........1,2,3, ......2,0,4,1,5, ....3,1,5,6,0,4,2, ..4,5,0,2,1,7,3,6,8, 5,3,1,4,6,8,9,2,7,0,10, ... CROSSREFS Inspired by A274528, A274641, A274650. Sequence in context: A104771 A307688 A056888 * A339451 A111182 A178142 Adjacent sequences: A286294 A286295 A286296 * A286298 A286299 A286300 KEYWORD nonn,tabf AUTHOR N. J. A. Sloane, Jun 01 2017 EXTENSIONS More terms from Alois P. Heinz, Jun 01 2017 STATUS approved

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Last modified March 25 03:12 EDT 2023. Contains 361511 sequences. (Running on oeis4.)