Number of n X 3 0..1 arrays with new values 0..1 introduced in row major order and no element equal to more than one of its immediate leftward or upward neighbors.
A208309
Number of n X 3 0..1 arrays with new values 0..1 introduced in row major order and no element equal to more than one of its immediate leftward or upward neighbors.
Terms
- a(0) =4a(1) =18a(2) =78a(3) =336a(4) =1446a(5) =6222a(6) =26772a(7) =115194a(8) =495654a(9) =2132688a(10) =9176478a(11) =39484326a(12) =169892196a(13) =731008002a(14) =3145363422a(15) =13533793104a(16) =58232875254a(17) =250562996958
External references
- oeis: A208309