Number of nX2 0..3 arrays with exactly floor(nX2/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.
A222829
Number of nX2 0..3 arrays with exactly floor(nX2/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.
Terms
- a(0) =0a(1) =4a(2) =32a(3) =613a(4) =7152a(5) =117140a(6) =1613820a(7) =24884991a(8) =363921808a(9) =5535894434a(10) =82950103964
External references
- oeis: A222829