T(n,k)=Number of nXk 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(k+1) binary array having a sum of three or less, with rows and columns of the latter in lexicographically nondecreasing order.
A227269
T(n,k)=Number of nXk 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(k+1) binary array having a sum of three or less, with rows and columns of the latter in lexicographically nondecreasing order.
Terms
- a(0) =2a(1) =3a(2) =3a(3) =4a(4) =8a(5) =4a(6) =5a(7) =16a(8) =16a(9) =5a(10) =6a(11) =30a(12) =49a(13) =30a(14) =6a(15) =7a(16) =54a(17) =132a(18) =132a(19) =54a(20) =7a(21) =8a(22) =93a(23) =341a(24) =513a(25) =341a(26) =93a(27) =8a(28) =9a(29) =153
External references
- oeis: A227269