Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,3,2,1,2 for x=0,1,2,3,4.

A197338

Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,3,2,1,2 for x=0,1,2,3,4.

Terms

    a(0) =1a(1) =8a(2) =38a(3) =167a(4) =681a(5) =2864a(6) =12148a(7) =51480a(8) =217587a(9) =919656a(10) =3889592a(11) =16451263a(12) =69570928a(13) =294209541a(14) =1244221402a(15) =5261851987a(16) =22252448435a(17) =94105875249a(18) =397975165117

External references