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 two, with rows and columns of the latter in lexicographically nondecreasing order.
A227103
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 two, with rows and columns of the latter in lexicographically nondecreasing order.
Terms
- a(0) =2a(1) =4a(2) =4a(3) =7a(4) =15a(5) =7a(6) =11a(7) =48a(8) =48a(9) =11a(10) =16a(11) =136a(12) =239a(13) =136a(14) =16a(15) =22a(16) =341a(17) =1084a(18) =1084a(19) =341a(20) =22a(21) =29a(22) =771a(23) =4444a(24) =8427a(25) =4444a(26) =771a(27) =29a(28) =37a(29) =1606
External references
- oeis: A227103