# A376292 (b-file synthesized from sequence entry) 0 1 1 0 2 0 3 0 4 24 5 60 6 240 7 1260 8 169344 9 1693440 10 17150400 11 187941600 12 12778698240 13 271809457920 14 5031211086720 15 91848556800000 16 4643532967772160 17 154079136039628800 18 4367731446302515200 19 117143657916761548800 20 5457792037686441984000