Number of 3Xn 0..3 arrays x(i,j) with each element horizontally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero.
A231109
Number of 3Xn 0..3 arrays x(i,j) with each element horizontally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero.
Terms
- a(0) =0a(1) =0a(2) =8a(3) =48a(4) =286a(5) =1748a(6) =10734a(7) =65934a(8) =404984a(9) =2487534a(10) =15279170a(11) =93849326a(12) =576451382a(13) =3540741892a(14) =21748327444a(15) =133584927368a(16) =820519778376
External references
- oeis: A231109