A162037 Number of n X n symmetric binary arrays with rows, considered as binary numbers, in nondecreasing order, and no more than 3 ones in any row

2, 5, 17, 69, 309, 1668, 10056, 66792, 487097, 3831282, 32364784, 291650388, 2787435921, 28151860269, 299220983205, 3336621374511, 38927257377509

Offset

1,1

Links

Table of n, a(n) for n=1..17.

Crossrefs

Sequence in context: A101971 A211387 A303952 * A319467 A326412 A183239

Adjacent sequences: A162034 A162035 A162036 * A162038 A162039 A162040

Keyword

nonn

Author

R. H. Hardin Jun 25 2009

Status

approved