Number of nX4 0..1 arrays with every element equal to 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero.
A297955
Number of nX4 0..1 arrays with every element equal to 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero.
Terms
- a(0) =2a(1) =13a(2) =25a(3) =78a(4) =233a(5) =779a(6) =2359a(7) =7024a(8) =21572a(9) =66763a(10) =202511a(11) =620170a(12) =1905989a(13) =5855288a(14) =17976712a(15) =55219917a(16) =169749644a(17) =521916367a(18) =1604541689a(19) =4934209891a(20) =15175681053a(21) =46676428419a(22) =143573044675a(23) =441645870265
External references
- oeis: A297955