# A068300 (b-file synthesized from sequence entry) 1 1 2 720 3 26910720 4 52288926842880 5 5281821340632604016640 6 27736206226949123988070609059840 7 7571810592000511584502349629565976352849920 8 107458741981038717371365660998262273071288547237109760000