T(n,k)=1/256 the number of (n+1)X(k+1) 0..3 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.
A183827
T(n,k)=1/256 the number of (n+1)X(k+1) 0..3 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.
Terms
- a(0) =1a(1) =15a(2) =15a(3) =225a(4) =813a(5) =225a(6) =3375a(7) =43947a(8) =43947a(9) =3375a(10) =50625a(11) =2377341a(12) =8538066a(13) =2377341a(14) =50625a(15) =759375a(16) =128578815a(17) =1661285961a(18) =1661285961a(19) =128578815a(20) =759375a(21) =11390625a(22) =6954559893a(23) =323115202755a(25) =323115202755a(26) =6954559893a(27) =11390625
External references
- oeis: A183827