# A369123 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 20 4 68 5 224 6 672 7 1584 8 880 9 -22880 10 -215072 11 -1414400 12 -8012032 13 -41344000 14 -198120448 15 -884348160 16 -3640426752 17 -13403384320 18 -40424947200 19 -65476561920 20 329862128640 21 4603911045120 22 35276325027840 23 221747978649600 24 1244854463643648