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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A098854 Number of triangle-free self-polar configurations of type (n_3). 3
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 2, 6, 40, 303 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,18

REFERENCES

A. Betten, G. Brinkmann and T. Pisanski, Counting symmetric configurations v_3, Discrete Appl. Math., 99 (2000), 331-338.

LINKS

Table of n, a(n) for n=1..21.

CROSSREFS

Cf. A001403, A098702, A023994.

Sequence in context: A081096 A119692 A264152 * A056787 A098852 A274482

Adjacent sequences:  A098851 A098852 A098853 * A098855 A098856 A098857

KEYWORD

nonn,hard

AUTHOR

N. J. A. Sloane, Nov 05 2004

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified March 26 23:19 EDT 2017. Contains 284141 sequences.