# A261341 (b-file synthesized from sequence entry) 1 1 2 2 3 4 4 6 5 12 6 30 7 36 8 42 9 72 10 240 11 420 12 600 13 900 14 1560 15 1764 16 3600 17 6084 18 8100 19 46440 20 1742400 21 4062240 22 35814240