A086266 Triangle of counts of s-clusters in n X n (0,1)-matrices for s=0, 1, ....

1, 1, 1, 13, 2, 1, 218, 208, 78, 6, 1, 1, 11506, 21172, 20262, 9560, 2593, 408, 32, 2

Offset

1,4

Links

Table of n, a(n) for n=1..20.

Eric Weisstein's World of Mathematics, s-Cluster

Example

Triangle begins:
  1, 1;
  1, 13, 2;
  1, 218, 208, 78, 6, 1;
  1, 11506, 21172, 20262, 9560, 2593, 408, 32, 2;
  ...

Crossrefs

Cf. A086265.

Sequence in context: A281092 A010223 A010222 * A217436 A040166 A100395

Adjacent sequences: A086263 A086264 A086265 * A086267 A086268 A086269

Keyword

nonn,tabf,more

Author

Eric W. Weisstein, Jul 14 2003

Status

approved