T(n,k)=Number of nXk (-1,0,1) arrays of determinants of 2X2 subblocks of some (n+1)X(k+1) binary array with rows and columns of the latter in lexicographically nondecreasing order.
A226870
T(n,k)=Number of nXk (-1,0,1) arrays of determinants of 2X2 subblocks of some (n+1)X(k+1) binary array with rows and columns of the latter in lexicographically nondecreasing order.
Terms
- a(0) =2a(1) =4a(2) =4a(3) =7a(4) =13a(5) =7a(6) =11a(7) =37a(8) =37a(9) =11a(10) =16a(11) =91a(12) =187a(13) =91a(14) =16a(15) =22a(16) =199a(17) =792a(18) =792a(19) =199a(20) =22a(21) =29a(22) =397a(23) =2866a(24) =6195a(25) =2866a(26) =397a(27) =29a(28) =37a(29) =736
External references
- oeis: A226870