A145789 Number of n X n binary arrays with all ones connected only either four adjacent vertically or four adjacent horizontally.

1, 1, 1, 15, 89, 904, 10469, 202299, 6253788, 295345323, 20297903190, 2062672356086, 313264131593508

Offset

1,4

Links

Table of n, a(n) for n=1..13.

Crossrefs

Sequence in context: A241433 A220150 A164541 * A010822 A316224 A022707

Adjacent sequences: A145786 A145787 A145788 * A145790 A145791 A145792

Keyword

nonn

Author

R. H. Hardin, Oct 19 2008

Status

approved