Number of nX4 0..1 arrays with every element equal to 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A300635
Number of nX4 0..1 arrays with every element equal to 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =2a(1) =15a(2) =34a(3) =97a(4) =300a(5) =1036a(6) =3313a(7) =11075a(8) =37067a(9) =122922a(10) =407858a(11) =1357514a(12) =4523493a(13) =15101162a(14) =50477243a(15) =168866252a(16) =565232270a(17) =1892399523a(18) =6336697206a(19) =21221333391a(20) =71076453037a(21) =238076082776a(22) =797517130607
External references
- oeis: A300635