# A367883 (b-file synthesized from sequence entry) 0 1 1 0 2 4 3 12 4 160 5 1440 6 20928 7 309120 8 5604352 9 110896128 10 2480762880 11 60669480960 12 1625897189376 13 47158671605760 14 1475038408015872 15 49434699759943680 16 1768135111433256960 17 67206058595340779520 18 2705431746964327759872