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A333887 Number of non-isomorphic 5 X 5 nonnegative integer symmetric matrices with all row and column sums equal to n up to permutations of rows and columns. 1
1, 1, 7, 29, 142, 556, 1919, 5793, 15758, 39131, 90185, 194905, 398773, 777708, 1454721, 2622421, 4575020, 7750397, 12787648, 20600441, 32473894, 50185556, 76161130, 113665307, 167041499, 242001146, 345981348, 488570133, 682023069, 941871068, 1287649789 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..30.

CROSSREFS

Row n=5 of A333737.

Sequence in context: A252832 A074468 A303091 * A179599 A266473 A297677

Adjacent sequences:  A333884 A333885 A333886 * A333888 A333889 A333890

KEYWORD

nonn

AUTHOR

Andrew Howroyd, Apr 08 2020

STATUS

approved

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Last modified January 21 08:58 EST 2022. Contains 350475 sequences. (Running on oeis4.)