A172554 Number of 2*n X 18 binary arrays with row sums 9 and column sums n.
1, 48620, 842090474940, 89365729945562642000, 21796558191507153941744357500, 8588121524476528848476120449733261520, 4623755659802671553551698062433487687144266000, 3100343219257976442736156588732505699555692275498897600, 2446263257880905042021634694206746192857701260816933527219717500
Offset: 0
Keywords
Links
- Christoph Koutschan, Table of n, a(n) for n = 0..22 (terms n=1..12 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=9 of A376935.
Extensions
a(0)=1 prepended by Andrew Howroyd, Oct 12 2024