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A140922
Number of 7 X 9 matrices with elements in 0..n with each row and each column in nondecreasing order. 7,9,n can be permuted, see formula.
0
1, 11440, 27810640, 24584605760, 10323075958624, 2424984388825856, 356031798904887040, 35384083398854927360
OFFSET
0,2
FORMULA
(empirical) set p,q,r to n,9,7 (in any order) in s=p+q+r-1; a(n) = product {i in 0..r-1} (binomial(s,p+i)*i!/(s-i)^(r-i-1))
CROSSREFS
Sequence in context: A257172 A269217 A154064 * A216363 A204569 A023071
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 05 2008
STATUS
approved