Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,0,1,2,3 for x=0,1,2,3,4.
A196680
Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,0,1,2,3 for x=0,1,2,3,4.
Terms
- a(0) =4a(1) =20a(2) =58a(3) =292a(4) =1235a(5) =5186a(6) =22461a(7) =96256a(8) =413032a(9) =1780597a(10) =7673860a(11) =33017186a(12) =142219489a(13) =612618957a(14) =2638803566a(15) =11367909928a(16) =48973948677a(17) =210982341958a(18) =908945163931
External references
- oeis: A196680