Number of n X 3 0..3 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, and upper left element zero.
A230801
Number of n X 3 0..3 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, and upper left element zero.
Terms
- a(0) =0a(1) =2a(2) =14a(3) =40a(4) =298a(5) =1546a(6) =8704a(7) =50450a(8) =286426a(9) =1650968a(10) =9481842a(11) =54537066a(12) =313793424a(13) =1805343618a(14) =10388621898a(15) =59779183384a(16) =343996534162
External references
- oeis: A230801