Number of (n+1) X (n+1) 0..1 arrays with every 2 X 2 subblock diagonal minimum minus antidiagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal maximum nondecreasing vertically.
A253224
Number of (n+1) X (n+1) 0..1 arrays with every 2 X 2 subblock diagonal minimum minus antidiagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal maximum nondecreasing vertically.
Terms
- a(0) =16a(1) =132a(2) =494a(3) =1498a(4) =3936a(5) =9630a(6) =22656a(7) =52110a(8) =118182a(9) =265458a(10) =591924a(11) =1311966a(12) =2892738a(13) =6348402a(14) =13873152a(15) =30199422a(16) =65504766a(17) =141618834a(18) =305248332a(19) =656098110
External references
- oeis: A253224