Number of nX4 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 3 and at least one element with value (x(i,j)-1) mod 3, and upper left element zero.
A230815
Number of nX4 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 3 and at least one element with value (x(i,j)-1) mod 3, and upper left element zero.
Terms
- a(0) =0a(1) =0a(2) =12a(3) =174a(4) =816a(5) =12210a(6) =108006a(7) =1202184a(8) =11797696a(9) =124336446a(10) =1262910682a(11) =13078190344a(12) =134042691720
External references
- oeis: A230815