Number of symmetric n X n 01-matrices with maximum number of 1s and no 2 X 2 all-1 submatrix.
A352801
Number of symmetric n X n 01-matrices with maximum number of 1s and no 2 X 2 all-1 submatrix.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =16a(5) =170a(6) =360a(7) =840a(8) =82320a(9) =181440a(10) =1512000a(11) =19958400a(12) =79833600a(13) =259459200a(14) =14529715200
External references
- oeis: A352801