T(n,k)=Number of nXk 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(k+1) binary array having determinant equal to one, with rows and columns of the latter in nondecreasing lexicographic order.
A227641
T(n,k)=Number of nXk 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(k+1) binary array having determinant equal to one, with rows and columns of the latter in nondecreasing lexicographic order.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =3a(4) =5a(5) =3a(6) =4a(7) =11a(8) =11a(9) =4a(10) =5a(11) =23a(12) =39a(13) =23a(14) =5a(15) =6a(16) =44a(17) =127a(18) =127a(19) =44a(20) =6a(21) =7a(22) =78a(23) =377a(24) =667a(25) =377a(26) =78a(27) =7a(28) =8a(29) =130
External references
- oeis: A227641