The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A067324 Third column of triangle A067323. 3
 2, 7, 23, 76, 255, 869, 3003, 10504, 37128, 132430, 476102, 1723528, 6277505, 22988385, 84592275, 312636240, 1159979700, 4319218530, 16134883410, 60452176200, 227110782990, 855361970034, 3228982640478 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Also third diagonal of triangle A028364. LINKS Table of n, a(n) for n=0..22. FORMULA a(n)= A067323(n+2, 2)= C(n+3)-(C(n+2)+C(n+1)), C(n) := A000108(n) (Catalan). G.f.: (c(x)^3)*(1+c(x)), with c(x) g.f. of A000108 (Catalan). CROSSREFS Cf. A000245 (second column). Sequence in context: A042575 A256030 A052924 * A047062 A292231 A292232 Adjacent sequences: A067321 A067322 A067323 * A067325 A067326 A067327 KEYWORD nonn,easy AUTHOR Wolfdieter Lang, Feb 05 2002 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.

Last modified September 27 07:09 EDT 2023. Contains 365674 sequences. (Running on oeis4.)