Number of nX4 0..1 arrays with every element equal to 2, 3, 4 or 5 king-move adjacent elements, with upper left element zero.
A297974
Number of nX4 0..1 arrays with every element equal to 2, 3, 4 or 5 king-move adjacent elements, with upper left element zero.
Terms
- a(0) =0a(1) =6a(2) =20a(3) =109a(4) =1042a(5) =7302a(6) =60427a(7) =481401a(8) =3880101a(9) =31362126a(10) =253173482a(11) =2046556093a(12) =16538800168a(13) =133678574420
External references
- oeis: A297974