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 zero, with rows and columns of the latter in lexicographically nondecreasing order.
A227125
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 zero, with rows and columns of the latter in lexicographically nondecreasing order.
Terms
- a(0) =2a(1) =3a(2) =3a(3) =4a(4) =7a(5) =4a(6) =5a(7) =13a(8) =13a(9) =5a(10) =6a(11) =23a(12) =33a(13) =23a(14) =6a(15) =7a(16) =40a(17) =81a(18) =81a(19) =40a(20) =7a(21) =8a(22) =68a(23) =202a(24) =295a(25) =202a(26) =68a(27) =8a(28) =9a(29) =112
External references
- oeis: A227125