A162038 Number of n X n symmetric binary arrays with rows, considered as binary numbers, in nondecreasing order, and no more than 4 ones in any row.

2, 5, 17, 86, 612, 5468, 62853, 856193, 13518083, 243899329, 4944615404, 111381110541, 2765327931184, 75061918010044

Offset

1,1

Links

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

Crossrefs

Sequence in context: A079805 A385951 A395974 * A162039 A162040 A162041

Adjacent sequences: A162035 A162036 A162037 * A162039 A162040 A162041

Keyword

nonn

Author

R. H. Hardin, Jun 25 2009

Status

approved