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

A197607

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

Terms

    a(0) =1a(1) =5a(2) =14a(3) =43a(4) =124a(5) =352a(6) =1025a(7) =2977a(8) =8619a(9) =24982a(10) =72411a(11) =209844a(12) =608174a(13) =1762633a(14) =5108427a(15) =14805217a(16) =42908476a(17) =124357153a(18) =360411436a(19) =1044543248a(20) =3027291501a(21) =8773685473a(22) =25427864489a(23) =73694947188a(24) =213582435997a(25) =619003863520

External references