# A154882 (b-file synthesized from sequence entry) 1 2 2 4 3 12 4 120 5 7560 6 8648640 7 1927522396800 8 4747472432036420486400 9 128438082648984172330026178330296384000 10 6184173455628205993842062057864303743050691444602955105860128640000