login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A027208 a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026725. 1
1, 4, 19, 72, 338, 1289, 6027, 23117, 107746, 415058, 1929383, 7456777, 34584731, 134005510, 620344059, 2408498148, 11131638368, 43289074671, 199800878749, 778025282080, 3586777011141, 13982303458588, 64394916131100, 251261623174835, 1156165698462868, 4514741175877259 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

MAPLE

A027208 := proc(n)

    add( A026725(n, k)*A026725(n, k+1), k=0..n-1) ;

end proc: # R. J. Mathar, Oct 21 2019

CROSSREFS

Sequence in context: A219972 A284224 A268214 * A085348 A027232 A256714

Adjacent sequences:  A027205 A027206 A027207 * A027209 A027210 A027211

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

Name corrected by R. J. Mathar, Oct 21 2019

More terms from Sean A. Irvine, Oct 24 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 19 03:44 EST 2019. Contains 329310 sequences. (Running on oeis4.)