Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,1,3,0,4 for x=0,1,2,3,4.
A196690
Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,1,3,0,4 for x=0,1,2,3,4.
Terms
- a(0) =2a(1) =5a(2) =11a(3) =34a(4) =101a(5) =299a(6) =890a(7) =2643a(8) =7855a(9) =23340a(10) =69355a(11) =206087a(12) =612384a(13) =1819689a(14) =5407175a(15) =16067330a(16) =47743801a(17) =141869903a(18) =421564034a(19) =1252670447a(20) =3722289195a(21) =11060719828a(22) =32866743207a(23) =97662975451a(24) =290203891328a(25) =862335989181
External references
- oeis: A196690