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 A124305 Riordan array (1,2*sqrt(3)*sin(asin(3*sqrt(3)*x/2)/3)/3). 3
 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 2, 0, 1, 0, 3, 0, 3, 0, 1, 0, 0, 7, 0, 4, 0, 1, 0, 12, 0, 12, 0, 5, 0, 1, 0, 0, 30, 0, 18, 0, 6, 0, 1, 0, 55, 0, 55, 0, 25, 0, 7, 0, 1, 0, 0, 143, 0, 88, 0, 33, 0, 8, 0, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,13 COMMENTS Inverse of A124304. Row sums are A047749. Diagonal sums appear to be aerated version of A098746. LINKS EXAMPLE Triangle begins .1, .0, 1, .0, 0, 1, .0, 1, 0, 1, .0, 0, 2, 0, 1, .0, 3, 0, 3, 0, 1, .0, 0, 7, 0, 4, 0, 1, .0, 12, 0, 12, 0, 5, 0, 1 Contribution from Paul Barry, Sep 28 2009: (Start) Production matrix is 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1 (End) CROSSREFS Sequence in context: A052173 A175790 A177825 * A087073 A242411 A243055 Adjacent sequences:  A124302 A124303 A124304 * A124306 A124307 A124308 KEYWORD easy,nonn,tabl AUTHOR Paul Barry, Oct 25 2006 STATUS approved

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Last modified December 20 16:24 EST 2014. Contains 252269 sequences.