The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A172040 Triangle T(n,k), read by rows, given by [0,1,2,1,2,1,2,1,2,1,2,...] DELTA [2,0,0,0,0,0,0,0,0,...] where DELTA is the operator defined in A084938. 0
1, 0, 2, 0, 2, 4, 0, 6, 8, 8, 0, 22, 28, 24, 16, 0, 90, 112, 96, 64, 32, 0, 394, 484, 416, 288, 160, 64, 0, 1806, 2200, 1896, 1344, 800, 384, 128, 0, 8558, 10364, 8952, 6448, 4000, 2112, 896, 256, 0, 41586, 50144, 43392, 31616, 20160, 11264, 5376, 2048, 512, 0 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
0,3
COMMENTS
Riordan array (1, 2x*f(x)) where f(x) is the g.f. of A001003 . Riordan production matrix is : (0, (2-x)/(1-x)).
LINKS
FORMULA
Sum_[k, 0<=k<=n} T(n,k)= A006318(n).
EXAMPLE
Triangle begins : 1 ; 0,2 ; 0,2,4 ; 0,6,8,8 ; 0,22,28,24,16 ; ...
CROSSREFS
Sequence in context: A137320 A263399 A143507 * A317327 A120557 A092594
KEYWORD
nonn,tabl
AUTHOR
Philippe Deléham, Jan 23 2010
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 13 22:21 EDT 2024. Contains 373391 sequences. (Running on oeis4.)