The number of 5 x 5 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.
A209836
The number of 5 x 5 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.
Terms
- a(0) =1a(1) =5a(2) =25a(3) =105a(4) =405a(5) =1425a(6) =4665a(7) =14265a(8) =41100a(9) =112140a(10) =291360a(11) =723960a(12) =1727310a(13) =3970770a(14) =8822010a(15) =18993870a(16) =39724500a(17) =80877480a(18) =160602600a(19) =311585340a(20) =591523950a(21) =1100383470a(22) =2008360650a(23) =3600512850a(24) =6346983390a(25) =11012013186a(26) =18821052030a(27) =31713870610a(28) =52723656830
External references
- oeis: A209836