# A048608 (b-file synthesized from sequence entry) 0 1 1 4 2 48 3 96 4 3840 5 30720 6 13440 7 2064384 8 92897280 9 594542592 10 130799370240 11 1121137459200 12 40809403514880 13 816188070297600 14 48971284217856000 15 5484783832399872000 16 62160883433865216000 17 1918107260244983808000