# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a209904 Showing 1-1 of 1 %I A209904 #12 Aug 11 2015 16:42:12 %S A209904 1,6,36,186,891,3936,16236,62736,228411,786866,2576112,8045502, %T A209904 24054897,69070032,191013552,510099312,1318511727,3305802762, %U A209904 8055148012,19108956342,44204128413,99858745488,220591105668,477091381728,1011385901553,2103707920494 %N A209904 The number of 6 X 6 matrices of nonnegative integers such that the sum of the entries in the i-th row equals the sum of the i-th column for each i and the total sum equals n. %Y A209904 Cf. A209836 (5 X 5 matrices). %K A209904 nonn %O A209904 0,2 %A A209904 _Kazunori Nakamoto_, _Shingo Okuyama_, Mar 15 2012 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE