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A058783 Number of n-rowed binary matrices with all row sums 4, up to row and column permutation; bipartite graphs with all nodes of degree 4 in a distinguished bipartite n-block, up to isomorphism. 9
1, 1, 5, 30, 332, 6414, 226041, 12848128, 1064292052, 119252205304, 17239075745190, 3113843614322530, 686491853010870156, 181386885029173595218, 56595769613704915215101, 20597536264356706999502705, 8652615103513713632218678155, 4157673185369121151936091009448 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..17.

Number of m-rowed binary matrices with all row sums equal to n, up to row and column permutation

CROSSREFS

Cf. A050535, A050913, A058784, A058785.

Sequence in context: A258300 A276752 A052172 * A203769 A264861 A264864

Adjacent sequences:  A058780 A058781 A058782 * A058784 A058785 A058786

KEYWORD

nonn

AUTHOR

Vladeta Jovovic, Nov 28 2000

EXTENSIONS

Terms a(8)-a(17) from Max Alekseyev, May 04 2018

STATUS

approved

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Last modified January 27 04:57 EST 2020. Contains 331291 sequences. (Running on oeis4.)