Number of nX2 0..2 arrays with exactly floor(nX2/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order.
A222913
Number of nX2 0..2 arrays with exactly floor(nX2/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order.
Terms
- a(0) =0a(1) =6a(2) =18a(3) =136a(4) =654a(5) =3972a(6) =21778a(7) =127226a(8) =727214a(9) =4237154a(10) =24617576a(11) =144049162a(12) =843945398a(13) =4961892900a(14) =29226194746a(15) =172530718840
External references
- oeis: A222913