A256373 - OEIS

A256373

The decimal values of binary sequences representing the "bits" form of adjacency matrices of non-isomorphic tournament graphs.

0, 5, 34, 36, 100, 165, 520, 528, 544, 549, 565, 814, 1552, 1589, 2568, 2577, 2592, 2593, 2597, 4629, 4663, 8245, 8328, 8469, 8748, 8757, 8765, 16448, 16484, 16512, 16549, 16640, 16645, 16896, 16901, 16904, 16932

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OFFSET

1,2

COMMENTS

For the tournaments on n vertices, the matrices consist of the first A000568(n)terms of the sequence.

LINKS

Table of n, a(n) for n=1..37.

Brendan McKay, Digraphs, Australian National University.

EXAMPLE

The 4x4 non-isomorphic tournament matrices are as follows:

The first has "bits" value 0, then second 5, the third 34, the fourth 36, where we read the bit pattern only from the elements above the diagonal, starting at the first row, left to right, then top to bottom.

There are twelve 5x5 non-isomorphic tournament matrices; their bit patterns are 0, 5, 34, 36, 100, 165, 520, 528, 544, 549, 565, 814.

CROSSREFS

Sequence in context: A276126 A193325 A303693 * A124936 A213063 A268281

Adjacent sequences: A256370 A256371 A256372 * A256374 A256375 A256376

KEYWORD

nonn

AUTHOR

Dan Parrish, Mar 26 2015

STATUS

approved