# A345445 (b-file synthesized from sequence entry) 1 0 2 1 3 15 4 196 5 2765 6 44136 7 803383 8 16595776 9 385606089 10 9980041600 11 285072169811 12 8912986937856 13 302831517446653 14 11111352988374016 15 437883428985915375 16 18446566229995503616 17 827237060699483900177 18 39346347252746333159424 19 1978418439209309500803979 20 104857574454528914145280000