A172555 Number of 2*n X 8 binary arrays with row sums 4 and column sums n.

1, 70, 44730, 60871300, 116963796250, 273957842462220, 729833528645228700, 2128370421607383353400, 6637298299496411164868250, 21796558191507153941744357500, 74580431332898028185458459628980, 263863554962023852690547420699517000, 959794291357783500093926796260896462300

Offset: 0

Author

R. H. Hardin, Feb 06 2010

Keywords

• nonn

Links

• Christoph Koutschan, Table of n, a(n) for n = 0..150 (terms n=1..33 from R. H. Hardin)
• Robert Dougherty-Bliss, Christoph Koutschan, Natalya Ter-Saakov, and Doron Zeilberger, The (Symbolic and Numeric) Computational Challenges of Counting 0-1 Balanced Matrices, arXiv:2410.07435 [math.CO], 2024.

Crossrefs

Column k=4 of A376935.

Extensions

a(0)=1 prepended by Christoph Koutschan, Oct 12 2024