257866domain: NAppears in sequencesT(n,k) = 12*A046802(n,k) - 9*A008518(n,k) - 2*A007318(n,k), triangle read by rows (0 <= k <= n).at n=40A168293Number of n X 2 (-1,0,1) arrays of determinants of 2 X 2 subblocks of some (n+1) X 3 binary array with rows and columns of the latter in lexicographically nondecreasing order.at n=24A226866