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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A127128 Column 1 of triangle A127126. 11
 1, 2, 9, 54, 412, 3834, 42131, 533558, 7645065, 122177706, 2153221318, 41464853266, 865908079369, 19484990264956, 469910189792853, 12089047867952058, 330423404118495975, 9561012695542004496 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Convolution square of A127131. LINKS G. C. Greubel, Table of n, a(n) for n = 1..80 MATHEMATICA T[n_, k_]:= T[n, k]= If[k==n, 1, Coefficient[(1 +x*Sum[x^(r-k-1)*Sum[T[r, c], {c, k+1, r}], {r, k+1, n}] + x^(n+1))^(k+1), x, n-k]]; Table[T[n, 1], {n, 1, 20}] (* G. C. Greubel, Jan 28 2020 *) CROSSREFS Cf. A127126; A127131; other columns: A127127, A127129, A127130. Sequence in context: A307442 A222014 A321974 * A353255 A254795 A064151 Adjacent sequences:  A127125 A127126 A127127 * A127129 A127130 A127131 KEYWORD nonn AUTHOR Paul D. Hanna, Jan 05 2007 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 July 2 03:47 EDT 2022. Contains 354985 sequences. (Running on oeis4.)