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.
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.
Terms
- a(0) =1a(1) =6a(2) =36a(3) =186a(4) =891a(5) =3936a(6) =16236a(7) =62736a(8) =228411a(9) =786866a(10) =2576112a(11) =8045502a(12) =24054897a(13) =69070032a(14) =191013552a(15) =510099312a(16) =1318511727a(17) =3305802762a(18) =8055148012a(19) =19108956342a(20) =44204128413a(21) =99858745488a(22) =220591105668a(23) =477091381728
External references
- oeis: A209904