# A155794 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 2 8 2 9 1 10 1 11 6 12 24 13 6 14 1 15 1 16 24 17 720 18 720 19 24 20 1 21 1 22 120 23 40320 24 362880 25 40320 26 120 27 1 28 1 29 720 30 3628800 31 479001600 32 479001600 33 3628800 34 720 35 1 36 1 37 5040 38 479001600 39 1307674368000 40 20922789888000 41 1307674368000 42 479001600 43 5040 44 1