A098841 Number of disconnected (decomposable) configurations of type (n_3).

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 4, 13, 47

Offset

1,16

Links

Table of n, a(n) for n=1..18.

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

Crossrefs

Cf. A001403, A023994.

Sequence in context: A014145 A354550 A143566 * A183775 A363547 A017944

Adjacent sequences: A098838 A098839 A098840 * A098842 A098843 A098844

Keyword

nonn,hard,more

Author

N. J. A. Sloane, Nov 05 2004

Status

approved