# A067001 (b-file synthesized from sequence entry) 0 1 1 4 2 6 3 24 4 60 5 42 6 160 7 560 8 688 9 308 10 1120 11 5040 12 8760 13 7080 14 2310 15 8064 16 44352 17 99456 18 114576 19 68712 20 17556 21 59136 22 384384 23 1055040 24 1572480 25 1351840 26 642824 27 134596 28 439296 29 3294720 30 10695168 31 19536000 32 21778560 33 14912064 34 5864640 35 1038312