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 A259100 Triangle read by rows, arising in the enumeration of corners. 1
 1, 0, 1, 0, 2, 1, 0, 3, 2, 1, 0, 4, 5, 2, 1, 0, 5, 8, 5, 2, 1, 0, 6, 14, 10, 5, 2, 1, 0, 7, 20, 18, 10, 5, 2, 1, 0, 8, 30, 30, 20, 10, 5, 2, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 LINKS G. Kreweras, Sur les extensions linéaires d'une famille particuliere d'ordres partiels, Discrete Math., 27 (1979), 279-295. G. Kreweras, Sur les extensions linéaires d'une famille particulière d'ordres partiels, Discrete Math., 27 (1979), 279-295. (Annotated scanned copy) FORMULA Kreweras gives a recurrence on page 281. EXAMPLE Triangle begins:   1;   0,  1;   0,  2,  1;   0,  3,  2,  1;   0,  4,  5,  2,  1;   0,  5,  8,  5,  2,  1;   0,  6, 14, 10,  5,  2,  1;   0,  7, 20, 18, 10,  5,  2,  1;   0,  8, 30, 30, 20, 10,  5,  2,  1;   ... CROSSREFS Row sums = A006330. Sequence in context: A025653 A131103 A180653 * A096652 A322133 A274183 Adjacent sequences:  A259097 A259098 A259099 * A259101 A259102 A259103 KEYWORD nonn,tabl,more AUTHOR N. J. A. Sloane, Jun 22 2015 STATUS approved

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Last modified January 22 07:39 EST 2020. Contains 331139 sequences. (Running on oeis4.)