Number of nX4 0..2 arrays with exactly floor(nX4/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order.
A222669
Number of nX4 0..2 arrays with exactly floor(nX4/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order.
Terms
- a(0) =3a(1) =9a(2) =40a(3) =348a(4) =2370a(5) =20606a(6) =212842a(7) =2134959a(8) =21085549a(9) =211716164a(10) =2136631932a(11) =21522095442a(12) =217024139551
External references
- oeis: A222669