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

A197274

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

Terms

    a(0) =3a(1) =9a(2) =14a(3) =29a(4) =67a(5) =134a(6) =275a(7) =583a(8) =1210a(9) =2511a(10) =5245a(11) =10926a(12) =22745a(13) =47405a(14) =98774a(15) =205765a(16) =428731a(17) =893294a(18) =1861163a(19) =3877815a(20) =8079642a(21) =16834247a(22) =35074949a(23) =73080470a(24) =152266769a(25) =317255517a(26) =661018310a(27) =1377265789a(28) =2869604691a(29) =5978971062

External references