# A304723 (b-file synthesized from sequence entry) 0 0 1 1 2 20 3 325 4 5000 5 75625 6 1137500 7 17078125 8 256250000 9 3844140625 10 57664062500 11 864970703125 12 12974609375000 13 194619384765625 14 2919291992187500 15 43789385986328125 16 656840820312500000 17 9852612457275390625 18 147789187622070312500 19 2216837818145751953125 20 33252567291259765625000