This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A124305 Riordan array (1, 2*sqrt(3)*sin(arcsin(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 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 A177825 A175790 * A087073 A297173 A242411 Adjacent sequences:  A124302 A124303 A124304 * A124306 A124307 A124308 KEYWORD easy,nonn,tabl AUTHOR Paul Barry, Oct 25 2006 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified March 20 04:00 EDT 2018. Contains 300953 sequences. (Running on oeis4.)