# A249769 (b-file synthesized from sequence entry) 1 1 2 3 3 2 4 18 5 6 6 114 7 24 8 792 9 120 10 6120 11 720 12 52560 13 5040 14 498960 15 40320 16 5201280 17 362880 18 59149440 19 3628800 20 729388800 21 39916800 22 9699782400 23 479001600 24 138431462400 25 6227020800 26 2110960051200 27 87178291200 28 34261068441600 29 1307674368000 30 589761139968000 31 20922789888000