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A351288 Number of symmetric 0-1 matrices with nondecreasing row sums. 2
1, 2, 6, 26, 182, 2170, 45640, 1728722, 119663816, 15307529470, 3650708270236, 1634796996516742, 1382620288569817496 (list; graph; refs; listen; history; text; internal format)
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

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Last modified June 4 15:08 EDT 2024. Contains 373099 sequences. (Running on oeis4.)