Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,2,1,0,0 for x=0,1,2,3,4.
A198181
Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,2,1,0,0 for x=0,1,2,3,4.
Terms
- a(0) =2a(1) =8a(2) =25a(3) =59a(4) =331a(5) =883a(6) =3485a(7) =12030a(8) =43774a(9) =155664a(10) =540628a(11) =1936313a(12) =6871687a(13) =24471790a(14) =86551688a(15) =306708029a(16) =1089956129a(17) =3870392120a(18) =13733968845a(19) =48703981505a(20) =172844148554a(21) =613561265167
External references
- oeis: A198181