Number of nX2 0..3 arrays with exactly floor(nX2/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.
A222741
Number of nX2 0..3 arrays with exactly floor(nX2/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.
Terms
- a(0) =0a(1) =6a(2) =20a(3) =685a(4) =5370a(5) =123410a(6) =1341616a(7) =25106526a(8) =321557310a(9) =5447475968a(10) =76079350800
External references
- oeis: A222741