A351288 Number of symmetric 0-1 matrices with nondecreasing row sums.

1, 2, 6, 26, 182, 2170, 45640, 1728722, 119663816, 15307529470, 3650708270236, 1634796996516742, 1382620288569817496

Offset

0,2

Links

Table of n, a(n) for n=0..12.

Crossrefs

Cf. A016121, A351158, A351287.

Sequence in context: A059430 A288607 A086584 * A355211 A211604 A032014

Adjacent sequences: A351285 A351286 A351287 * A351289 A351290 A351291

Keyword

nonn,more

Author

Max Alekseyev, Feb 06 2022

Extensions

a(8)-a(12) from Andrew Howroyd, Feb 06 2022

Status

approved