# A356179 (b-file synthesized from sequence entry) 1 1 2 5 3 35 4 70 5 210 6 420 7 2310 8 4620 9 18480 10 32340 11 60060 12 120120 13 240240 14 720720 15 1141140 16 2042040 17 4084080 18 4564560 19 13693680 20 19399380 21 38798760 22 77597520 23 232792560 24 387987600