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A098841 Number of disconnected (decomposable) configurations of type (n_3). 3
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 4, 13, 47 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,16

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..18.

CROSSREFS

Cf. A001403, A023994.

Sequence in context: A149439 A014145 A143566 * A017944 A017945 A055451

Adjacent sequences:  A098838 A098839 A098840 * A098842 A098843 A098844

KEYWORD

nonn,hard

AUTHOR

N. J. A. Sloane, Nov 05 2004

STATUS

approved

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Last modified March 27 04:42 EDT 2017. Contains 284144 sequences.