Number of n X n 0..1 arrays with every element equal to 1 or 2 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A300343
Number of n X n 0..1 arrays with every element equal to 1 or 2 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =0a(1) =2a(2) =9a(3) =58a(4) =306a(5) =1371a(6) =5451a(7) =20316a(8) =73826a(9) =268227a(10) =988143a(11) =3710046a(12) =14186486a(13) =55056941a(14) =215998713a(15) =853659146a(16) =3389857782a(17) =13500951049a(18) =53867577061
External references
- oeis: A300343