# A361522 (b-file synthesized from sequence entry) 0 1 1 0 2 1 3 0 4 2 5 0 6 6 7 0 8 24 9 0 10 120 11 0 12 720 13 0 14 5040 15 0 16 40320 17 0 18 362880 19 0 20 3628800 21 0 22 39916800 23 0 24 479001600 25 0 26 6227020800 27 0 28 87178291200 29 0 30 1307674368000 31 0 32 20922789888000 33 0 34 355687428096000 35 0 36 6402373705728000 37 0 38 121645100408832000 39 0 40 2432902008176640000