Number of n X 3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,3,2,1,0 for x=0,1,2,3,4.

A197212

Number of n X 3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,3,2,1,0 for x=0,1,2,3,4.

Terms

    a(0) =1a(1) =5a(2) =14a(3) =44a(4) =149a(5) =479a(6) =1537a(7) =4971a(8) =16088a(9) =52020a(10) =168111a(11) =543379a(12) =1756623a(13) =5678611a(14) =18356490a(15) =59338576a(16) =191817551a(17) =620069245a(18) =2004431603a(19) =6479507953a(20) =20945607368a(21) =67708621756a(22) =218874399841a(23) =707531760601

External references