# A138441 (b-file synthesized from sequence entry) 1 30 2 360 3 7800 4 58800 5 885720 6 2413320 7 12068640 8 23522760 9 74017680 10 297411240 11 443751360 12 1282862520 13 2375051280 14 3160680600 15 5389606560 16 11082179160 17 21090265080 18 25760185320 19 45229188840 20 64050139440 21 75667110480 22 121543724640 23 163470183240