# A351884 (b-file synthesized from sequence entry) 0 1 1 0 2 1 3 0 4 2 5 0 6 6 7 6 8 0 9 24 10 24 11 0 12 120 13 240 14 0 15 720 16 1440 17 720 18 0 19 5040 20 15120 21 5040 22 0 23 40320 24 120960 25 80640 26 0 27 362880 28 1451520 29 1088640 30 0 31 3628800 32 14515200 33 14515200 34 3628800 35 0 36 39916800 37 199584000 38 199584000 39 39916800 40 0 41 479001600 42 2395008000 43 3353011200 44 958003200