37648072704domain: NAppears in sequencesNumber of (n+1) X (n+1) 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly one clockwise edge increases.at n=21A207042(1/8) times the sum of the elements of all subsets of [n] whose sum is divisible by eight.at n=33A309300