A145925 Number of n X n binary arrays with all ones connected only in a tee 1,1 1,2 1,3 2,2 in any orientation.

1, 1, 9, 33, 404, 7941, 262632, 14831415, 1538127410, 275592188347, 87279885007004, 48561755814534966, 47514836691753883015, 81822578894266356858585

Offset

1,3

Links

Table of n, a(n) for n=1..14.

Example

Maximal 8 X 8 example
.1.1.1.0.1.1.1.0
.0.1.0.0.0.1.0.1
.1.0.0.0.0.0.1.1
.1.1.0.1.0.1.0.1
.1.0.1.1.0.1.1.0
.0.0.0.1.0.1.0.1
.1.1.1.0.1.0.1.1
.0.1.0.1.1.1.0.1

Crossrefs

Sequence in context: A172498 A276284 A275695 * A028568 A199298 A345923

Adjacent sequences: A145922 A145923 A145924 * A145926 A145927 A145928

Keyword

nonn

Author

R. H. Hardin, Oct 25 2008

Status

approved