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 one or less, with rows and columns of the latter in lexicographically nondecreasing order.
A227165
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 one 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) =18a(8) =18a(9) =5a(10) =6a(11) =36a(12) =62a(13) =36a(14) =6a(15) =7a(16) =66a(17) =193a(18) =193a(19) =66a(20) =7a(21) =8a(22) =113a(23) =558a(24) =944a(25) =558a(26) =113a(27) =8a(28) =9a(29) =183
External references
- oeis: A227165