The number of upper-triangular matrices with integer entries whose absolute sum is equal to n and such that each row contains a nonzero entry.
A289313
The number of upper-triangular matrices with integer entries whose absolute sum is equal to n and such that each row contains a nonzero entry.
Terms
- a(0) =1a(1) =2a(2) =10a(3) =74a(4) =722a(5) =8786a(6) =128218a(7) =2182554a(8) =42456226a(9) =929093538a(10) =22590839466a(11) =604225121258
External references
- oeis: A289313