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.

1, 1, 5, 30, 332, 6414, 226041, 12848128, 1064292052, 119252205304, 17239075745190, 3113843614322530, 686491853010870156, 181386885029173595218, 56595769613704915215101, 20597536264356706999502705, 8652615103513713632218678155, 4157673185369121151936091009448

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

Row n=4 of A331461.

Cf. A050535, A050913, A058784, A058785.

Sequence in context: A276752 A380607 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