# A102559 (b-file synthesized from sequence entry) 1 4 2 8 3 20 4 560 5 560 6 440 7 7280 8 160160 9 2722720 10 51731680 11 51731680 12 45762640 13 1487285800 14 5949143200 15 86262576400 16 10696559473600 17 368846878400 18 562976814400 19 395772700523200 20 395772700523200 21 16226680721451200