Number of nX4 0..1 arrays with every element equal to 1, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.
A301611
Number of nX4 0..1 arrays with every element equal to 1, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.
Terms
- a(0) =2a(1) =34a(2) =367a(3) =3816a(4) =40085a(5) =421025a(6) =4422826a(7) =46459647a(8) =488047397a(9) =5126802206a(10) =53855652961a(11) =565739028561
External references
- oeis: A301611