# A085867 (b-file synthesized from sequence entry) 1 2 2 12 3 105 4 1008 5 10080 6 100352 7 1000188 8 10001880 9 100018800 10 1000188000 11 10001880000 12 100018800000 13 1000188000000 14 10001880000000 15 100018800000000 16 1000188000000000 17 10001473779644928 18 100008061430022144