# A048870 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 4 4 10 5 1 6 30 7 132 8 27 9 1 10 336 11 2232 12 696 13 52 14 1 15 5040 16 46320 17 19500 18 2200 19 85 20 1 21 95040 22 1141920 23 606960 24 91800 25 5340 26 126 27 1 28 2162160 29 32639040 30 20991600 31 3986640 32 310170 33 11004 34 175 35 1 36 57657600 37 1061746560 38 802287360 39 183550080