Number of lower triangles of an n X n integer array with all row and column sums zero and all row and column sums of squares <=72.
A195890
Number of lower triangles of an n X n integer array with all row and column sums zero and all row and column sums of squares <=72.
Terms
- a(0) =1a(1) =1a(2) =13a(3) =1105a(4) =680115a(5) =3204150229
External references
- oeis: A195890