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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A091489 Number of asymmetric 2,3 cacti (triangular cacti with bridges). 0

%I

%S 1,0,0,0,0,1,3,7,21,57,159,435,1217,3400,9633,27413,78733,227489,

%T 661984,1937211,5701733,16865522,50126650,149627241,448448400,

%U 1349060262,4072508115,12333762442,37466367898,114133581762

%N Number of asymmetric 2,3 cacti (triangular cacti with bridges).

%H <a href="/index/Ca#cacti">Index entries for sequences related to cacti</a>

%F G.f.: A(x) = B(x)-B(x)^2/2-B(x^2)/2+B(x^3)/3-B(x)^3/3 where B is g.f. of A091488

%K nonn

%O 1,7

%A _Christian G. Bower_, Jan 14 2004

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified June 19 13:50 EDT 2013. Contains 226411 sequences.