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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A026726 T(2n,n), T given by A026725. 9
1, 2, 7, 27, 108, 440, 1812, 7514, 31307, 130883, 548547, 2303413, 9686617, 40783083, 171868037, 724837891, 3058850316, 12915186640, 54554594416, 230526280814, 974414815782, 4119854160332, 17422801069670, 73695109608352 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..23.

Paul Barry, A Catalan Transform and Related Transformations on Integer Sequences, Journal of Integer Sequences, Vol. 8 (2005), Article 05.4.5.

FORMULA

a(n)= sum{k=0..n, A039599(n,k)*A000045(k+1)}. [From Philippe Deléham, Feb 11 2009]

a(n)=Sum_{k, 0<=k<=n}A106566(n,k)*A122367(k). [From Philippe Deléham, Feb 11 2009]

From Philippe Deléham, Feb 02 2014: (Start)

a(n) = Sum_{k=0..n} A236843(n+k,2*k).

a(n) = Sum_{k=0..n} A236830(n,k).

a(n) = A236830(n+1,1).

a(n) = A165407(3*n).

G.f.: C(x)/(1-x*C(x)^3), C(x) the g.f. of A000108. (End)

CROSSREFS

Cf. A000045, A000108, A026725.

Sequence in context: A150594 A150595 A150596 * A150597 A150598 A026759

Adjacent sequences:  A026723 A026724 A026725 * A026727 A026728 A026729

KEYWORD

nonn

AUTHOR

Clark Kimberling

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.

License Agreements, Terms of Use, Privacy Policy .

Last modified February 20 10:37 EST 2018. Contains 299385 sequences. (Running on oeis4.)