login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A140917 Number of 8 X 8 matrices with elements in 0..n with each row and each column in nondecreasing order. 8,8,n can be permuted, see formula. 0
1, 12870, 34763300, 33803832920, 15484613937936, 3940599631842016, 623055648083552320, 66345156372852988800 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..7.

FORMULA

(empirical) set p,q,r to n,8,8 (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: A245861 A068359 A177310 * A177311 A177312 A172609

Adjacent sequences:  A140914 A140915 A140916 * A140918 A140919 A140920

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 05 2008

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 21 15:18 EDT 2021. Contains 348155 sequences. (Running on oeis4.)