67306domain: NAppears in sequencesFloor[ concatenation of n+2, n+1 and n divided by 3 ].at n=18A075004Number of n X 2 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 3 binary array having a sum of one or less, with rows and columns of the latter in lexicographically nondecreasing order.at n=35A227161