The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A122431 Riordan array ((1+x)^3,x). 1
 1, 3, 1, 3, 3, 1, 1, 3, 3, 1, 0, 1, 3, 3, 1, 0, 0, 1, 3, 3, 1, 0, 0, 0, 1, 3, 3, 1, 0, 0, 0, 0, 1, 3, 3, 1, 0, 0, 0, 0, 0, 1, 3, 3, 1, 0, 0, 0, 0, 0, 0, 1, 3, 3, 1, 0, 0, 0, 0, 0, 0, 0, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Row sums are A115291. Diagonal sums are A113311. Inverse is A122432. Sequence array for C(3,n). LINKS FORMULA Number triangle T(n,k)=C(3,n-k) EXAMPLE Triangle begins 1, 3,1, 3,3,1, 1,3,3,1, 0,1,3,3,1, 0,0,1,3,3,1, 0,0,0,1,3,3,1, 0,0,0,0,1,3,3,1 CROSSREFS Sequence in context: A298262 A124814 A122567 * A279340 A089607 A216637 Adjacent sequences:  A122428 A122429 A122430 * A122432 A122433 A122434 KEYWORD easy,nonn,tabl AUTHOR Paul Barry, Sep 04 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified July 25 16:39 EDT 2021. Contains 346291 sequences. (Running on oeis4.)