# A116447 (b-file synthesized from sequence entry) 0 0 1 1 2 1 3 1 4 2 5 2 6 3 7 6 8 4 9 24 10 5 11 120 12 6 13 720 14 7 15 5040 16 8 17 40320 18 9 19 362880 20 10 21 3628800 22 11 23 39916800 24 12 25 479001600 26 13 27 6227020800 28 14 29 87178291200 30 15 31 1307674368000 32 16 33 20922789888000 34 17 35 355687428096000 36 18 37 6402373705728000 38 19 39 121645100408832000