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!)
A026992 a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026692. 0
1, 4, 15, 72, 385, 1740, 7200, 33892, 174369, 806288, 3477513, 16493280, 84033826, 393038584, 1732173866, 8260858904, 41899043017, 197360311690, 881681864213, 4220575766976, 21345258947469, 101030588041560, 455632655173002, 2186903113868104, 11036726477564350, 52421656397330054 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..26.

CROSSREFS

Sequence in context: A085349 A185133 A278640 * A039764 A171005 A303229

Adjacent sequences: A026989 A026990 A026991 * A026993 A026994 A026995

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Sean A. Irvine, Oct 21 2019

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 March 23 10:58 EDT 2023. Contains 361443 sequences. (Running on oeis4.)