Number of (n+1) X (1+1) 0..3 arrays with no element greater than all horizontal neighbors or equal to all vertical neighbors.

A238923

Number of (n+1) X (1+1) 0..3 arrays with no element greater than all horizontal neighbors or equal to all vertical neighbors.

Terms

    a(0) =12a(1) =36a(2) =144a(3) =540a(4) =2052a(5) =7776a(6) =29484a(7) =111780a(8) =423792a(9) =1606716a(10) =6091524a(11) =23094720a(12) =87558732a(13) =331960356a(14) =1258557264a(15) =4771552860a(16) =18090330372a(17) =68585649696a(18) =260027940204a(19) =985840769700

External references