Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,2,1,0,0 for x=0,1,2,3,4.
A197175
Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,2,1,0,0 for x=0,1,2,3,4.
Terms
- a(0) =2a(1) =10a(2) =41a(3) =150a(4) =665a(5) =2695a(6) =11424a(7) =47528a(8) =199485a(9) =834267a(10) =3494391a(11) =14627589a(12) =61246810a(13) =256420026a(14) =1073586408a(15) =4494857066a(16) =18819026026a(17) =78791164317a(18) =329881701180
External references
- oeis: A197175