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

A196700

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

Terms

    a(0) =1a(1) =2a(2) =4a(3) =6a(4) =12a(5) =22a(6) =40a(7) =74a(8) =136a(9) =250a(10) =460a(11) =846a(12) =1556a(13) =2862a(14) =5264a(15) =9682a(16) =17808a(17) =32754a(18) =60244a(19) =110806a(20) =203804a(21) =374854a(22) =689464a(23) =1268122a(24) =2332440a(25) =4290026a(26) =7890588a(27) =14513054a(28) =26693668a(29) =49097310

External references