Number of n X n 0..1 arrays with every element equal to 1, 2 or 4 horizontally or vertically adjacent elements, with upper left element zero.
A301663
Number of n X n 0..1 arrays with every element equal to 1, 2 or 4 horizontally or vertically adjacent elements, with upper left element zero.
Terms
- a(0) =0a(1) =3a(2) =30a(3) =564a(4) =21224a(5) =1537496a(6) =225780260a(7) =68862687289
External references
- oeis: A301663