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 or less, with rows and columns of the latter in lexicographically nondecreasing order.
A227263
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 or less, with rows and columns of the latter in lexicographically nondecreasing order.
Terms
- a(0) =2a(1) =3a(2) =3a(3) =4a(4) =9a(5) =4a(6) =5a(7) =23a(8) =23a(9) =5a(10) =6a(11) =50a(12) =98a(13) =50a(14) =6a(15) =7a(16) =96a(17) =353a(18) =353a(19) =96a(20) =7a(21) =8a(22) =168a(23) =1111a(24) =2201a(25) =1111a(26) =168a(27) =8a(28) =9a(29) =274
External references
- oeis: A227263