Number of n X 1 0..5 arrays with no element x(i,j) adjacent to value 5-x(i,j) horizontally or vertically, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order.
A233106
Number of n X 1 0..5 arrays with no element x(i,j) adjacent to value 5-x(i,j) horizontally or vertically, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =23a(4) =99a(5) =452a(6) =2136a(7) =10313a(8) =50469a(9) =249062a(10) =1235466a(11) =6147803a(12) =30650439a(13) =152986472a(14) =764135196a(15) =3818284493a(16) =19084248009a(17) =95399716682a(18) =476934013326
External references
- oeis: A233106