login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A351158 Number of n X n symmetric 0-1 matrices where rows are sorted lexicographically and row sums are nondecreasing. 2
2, 5, 15, 56, 275, 1897, 18948 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..7.

CROSSREFS

Sequence in context: A121392 A216388 A005976 * A187981 A334155 A348365

Adjacent sequences: A351155 A351156 A351157 * A351159 A351160 A351161

KEYWORD

nonn,hard,more

AUTHOR

Max Alekseyev, Feb 02 2022

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 4 05:49 EST 2023. Contains 360046 sequences. (Running on oeis4.)