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 <=2.
A195885
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 <=2.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =15a(4) =83a(5) =591a(6) =5281a(7) =56249a(8) =704129a(9) =10236185a(10) =170423795a(11) =3211956071a(12) =67925755107
External references
- oeis: A195885