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

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A032161 Number of rooted compound windmills with n nodes and leaves of 2 colors where any 2 submills extending from the same node are different. 1
2, 2, 3, 7, 18, 48, 145, 444, 1393, 4507, 14759, 49142, 165317, 562091, 1925899, 6647608, 23092972, 80660663, 283138682, 998248096, 3533524793, 12552572322, 44737515682, 159919954982, 573214555207, 2059779884427 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
C. G. Bower, Transforms (2)
FORMULA
Shifts left under "CGK" (necklace, element, unlabeled) transform.
PROG
(PARI)
CGK(v)={apply(p->subst(serlaplace(p/y), y, 1), Vec(prod(k=1, #v, (1 + x^k*y + O(x*x^#v))^v[k])-1, -#v))}
seq(n)={my(v=[2]); for(i=2, n, v=concat([2], CGK(v))); v} \\ Andrew Howroyd, Sep 20 2018
CROSSREFS
Sequence in context: A128776 A117387 A113842 * A265801 A098738 A291742
KEYWORD
nonn
AUTHOR
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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 29 10:22 EDT 2024. Contains 371268 sequences. (Running on oeis4.)