Number of 2 X n 0..3 arrays x(i,j) with each element horizontally, diagonally or antidiagonally 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, no adjacent elements equal, and upper left element zero.
A231050
Number of 2 X n 0..3 arrays x(i,j) with each element horizontally, diagonally or antidiagonally 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, no adjacent elements equal, and upper left element zero.
Terms
- a(0) =0a(1) =2a(2) =14a(3) =32a(4) =100a(5) =428a(6) =1616a(7) =5784a(8) =21248a(9) =78840a(10) =290776a(11) =1070552a(12) =3946728a(13) =14554440a(14) =53657032a(15) =197805128a(16) =729249064a(17) =2688543176a(18) =9911794984a(19) =36541580104a(20) =134717359592a(21) =496660701448
External references
- oeis: A231050