# A112356 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 1 4 6 5 4 6 1 7 24 8 210 9 8 10 1 11 120 12 332640 13 32760 14 16 15 1 16 720 17 29059430400 18 19275223968000 19 20389320 20 32 21 1 22 5040 23 223016017416192000 24 1250004633476421848894668800000 25 28844656968251942737920000 26 48920775120 27 64