A162028 Number of n X n symmetric binary arrays with rows, considered as binary numbers, in nondecreasing order, and all but the outermost 2 rows or columns zero

86, 393, 1319, 4133, 12139, 33357, 85798, 207283, 472758, 1023449, 2114041, 4186441, 7981693, 14705357, 26266256, 45614055, 77207792, 127655369, 206573275, 327726605, 510521919, 781939821, 1179010506, 1751954107, 2568128666

Offset

4,1

Links

R. H. Hardin, Table of n, a(n) for n=4..100

Crossrefs

Sequence in context: A043379 A256804 A368940 * A157443 A035136 A202524

Adjacent sequences: A162025 A162026 A162027 * A162029 A162030 A162031

Keyword

nonn

Author

R. H. Hardin Jun 25 2009

Status

approved