# A138447 (b-file synthesized from sequence entry) 1 5 2 60 3 1300 4 9800 5 147620 6 402220 7 2011440 8 3920460 9 12336280 10 49568540 11 73958560 12 213810420 13 395841880 14 526780100 15 898267760 16 1847029860 17 3515044180 18 4293364220 19 7538198140 20 10675023240 21 12611185080 22 20257287440 23 27245030540