# A375304 (b-file synthesized from sequence entry) 0 1 1 0 2 0 3 1 4 2 5 24 6 0 7 4 8 672 9 358560 10 1 11 20 12 38976 13 476850240 14 20911317073920 15 0 16 100 17 3550848 18 1304813266560 19 2432400136566865920 20 15510918113914245120000000 21 1 22 620 23 471899904 24 6394544826128640 25 620390024129961834577920 26 265250998502017388926894080000000 27 371993135808163790752351286618750976000000