T(n,k) = Number of n X k 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X (k+1) binary array having two adjacent 1's and two adjacent 0's.
A227442
T(n,k) = Number of n X k 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X (k+1) binary array having two adjacent 1's and two adjacent 0's.
Terms
- a(0) =2a(1) =4a(2) =4a(3) =8a(4) =16a(5) =8a(6) =16a(7) =62a(8) =62a(9) =16a(10) =32a(11) =240a(12) =457a(13) =240a(14) =32a(15) =64a(16) =932a(17) =3346a(18) =3346a(19) =932a(20) =64a(21) =128a(22) =3620a(23) =24568a(24) =46126a(25) =24568a(26) =3620a(27) =128a(28) =256a(29) =14056
External references
- oeis: A227442