# A013702 (b-file synthesized from sequence entry) 1 1 2 2048 3 832040 4 193710244 5 34673583028 6 5372862566400 7 763562937059280 8 102703589621825280 9 13319075453502743045 10 1684658996331320739600 11 209381188023138094045641 12 25698882980999585848747760