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A124305 Riordan array (1,2*sqrt(3)*sin(asin(3*sqrt(3)*x/2)/3)/3). +0
4
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; listen)
OFFSET

0,13

COMMENT

Inverse of A124304. Row sums are A047749. Diagonal sums appear to be aerated version of A098746.

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

CROSSREFS

Sequence in context: A108044 A104477 A052173 this_sequence A087073 A106844 A125989

Adjacent sequences: A124302 A124303 A124304 this_sequence A124306 A124307 A124308

KEYWORD

easy,nonn,tabl

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Oct 25 2006

page 1

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.


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