login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A245754 Number of identity trees with n nodes where the maximal outdegree (branching factor) equals 9. 2
6, 63, 400, 2003, 8749, 34754, 128907, 453653, 1531833, 5001990, 15888511, 49313315, 150075356, 449080945, 1324309374, 3855721297, 11100436053, 31641094693, 89395066791, 250570651706, 697347017396, 1928281739720, 5300986280922, 14495618055341, 39446850848309 (list; graph; refs; listen; history; text; internal format)
OFFSET

36,1

LINKS

Alois P. Heinz, Table of n, a(n) for n = 36..800

MAPLE

b:= proc(n, i, t, k) option remember; `if`(n=0, 1,

      `if`(i<1, 0, add(binomial(b(i-1$2, k$2), j)*

       b(n-i*j, i-1, t-j, k), j=0..min(t, n/i))))

    end:

a:= n-> b(n-1$2, 9$2) -b(n-1$2, 8$2):

seq(a(n), n=36..70);

CROSSREFS

Column k=9 of A244523.

Sequence in context: A053700 A296393 A123615 * A267248 A053535 A268220

Adjacent sequences:  A245751 A245752 A245753 * A245755 A245756 A245757

KEYWORD

nonn

AUTHOR

Joerg Arndt and Alois P. Heinz, Jul 31 2014

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 July 8 07:16 EDT 2020. Contains 335513 sequences. (Running on oeis4.)