Number of nX4 0..1 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.
A202975
Number of nX4 0..1 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.
Terms
- a(0) =1a(1) =7a(2) =58a(3) =385a(4) =2582a(5) =17740a(6) =122468a(7) =846908a(8) =5858575a(9) =40519184a(10) =280214415a(11) =1937863565a(12) =13401760093a(13) =92683431379a(14) =640976755990
External references
- oeis: A202975