# A233044 (b-file synthesized from sequence entry) 1 1 2 1 3 5 4 2 5 65 6 24 7 163 8 60 9 1957 10 720 11 685 12 252 13 109601 14 40320 15 98641 16 36288 17 9864101 18 3628800 19 13563139 20 4989600 21 260412269 22 95800320 23 8463398743 24 3113510400 25 47395032961 26 17435658240 27 888656868019 28 326918592000