Number of nX3 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.

A197275

Number of nX3 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) =4a(1) =14a(2) =34a(3) =92a(4) =317a(5) =888a(6) =2626a(7) =8078a(8) =24103a(9) =72107a(10) =217970a(11) =656610a(12) =1975147a(13) =5955136a(14) =17950843a(15) =54086244a(16) =163025795a(17) =491430743a(18) =1481229421a(19) =4464844849a(20) =13458804609a(21) =40569450638a(22) =122290929298a(23) =368632726282

External references