# A277257 (b-file synthesized from sequence entry) 1 0 2 8 3 0 4 96 5 384 6 12 7 3456 8 460800 9 236160 10 96 11 168960 12 3065610240 13 125962905600 14 764467200 15 3120 16 12211200 17 51115799347200 18 453840358706380800 19 226918953109094400 20 6383697868800 21 115200 22 1196052480 23 1816224465420288000 24 6896429934345052028928000