# A001337 (b-file synthesized from sequence entry) 1 0 2 0 3 48 4 264 5 1680 6 11640 7 86352 8 673104 9 5424768 10 44828400 11 377810928 12 3235366752 13 28074857616 14 246353214240 15 2182457514960 16 19495053028800 17 175405981214592