Number of nX4 0..3 arrays x(i,j) with each element horizontally, vertically 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.
A230827
Number of nX4 0..3 arrays x(i,j) with each element horizontally, vertically 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) =6a(2) =10a(3) =62a(4) =176a(5) =734a(6) =3034a(7) =12962a(8) =55806a(9) =241462a(10) =1047244a(11) =4548392a(12) =19770622a(13) =85983476a(14) =374071534a(15) =1627718734a(16) =7083554700a(17) =30828250368a(18) =134171670508a(19) =583957263660
External references
- oeis: A230827