# A336633 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 2 4 6 5 16 6 6 7 24 8 116 9 116 10 24 11 120 12 888 13 1624 14 888 15 120 16 720 17 7416 18 20984 19 20984 20 7416 21 720 22 5040 23 67968 24 270432 25 419680 26 270432 27 67968 28 5040 29 40320 30 682272 31 3587904 32 7861664 33 7861664 34 3587904 35 682272 36 40320 37 362880 38 7467840 39 49701024 40 144570624 41 204403264 42 144570624