Number of lower triangles of an n X n -6..6 array with all row and column sums zero.
A195520
Number of lower triangles of an n X n -6..6 array with all row and column sums zero.
Terms
- a(0) =1a(1) =1a(2) =13a(3) =1105a(4) =1089411a(5) =11131321791
External references
- oeis: A195520