Number of n X n 0..1 arrays with diagonals and antidiagonals unimodal and rows nondecreasing.
A223943
Number of n X n 0..1 arrays with diagonals and antidiagonals unimodal and rows nondecreasing.
Terms
- a(0) =2a(1) =9a(2) =54a(3) =321a(4) =1821a(5) =9919a(6) =52532a(7) =272997a(8) =1401993a(9) =7150718a(10) =36352875a(11) =184670276a(12) =938969921a(13) =4783571827a(14) =24431153268a(15) =125119394092
External references
- oeis: A223943