# A343574 (b-file synthesized from sequence entry) 1 1 2 6 3 30 4 272 5 3130 6 46794 7 823550 8 16778544 9 387420768 10 10000018820 11 285311670622 12 8916100779324 13 302875106592266 14 11112006832146486 15 437893890380925960 16 18446744073860555680 17 827240261886336764194 18 39346408075300413088392