# A221161 (b-file synthesized from sequence entry) 0 1 1 7 2 72 3 1056 4 19968 5 460800 6 12533760 7 392232960 8 13872660480 9 546979184640 10 23781703680000 11 1130106558873600 12 58263271479705600 13 3238634262940876800 14 193064390900475494400 15 12285915784575713280000 16 831229959367865401344000 17 59578968979556190388224000