k[1] = 16/5
k[2] = 1/2
k[3] = 3/10
k[4] = 1000
k[5] = 1200/247
k[6] = 53615828388897/1250000000000
k[7] = 9/10
k[8] = 253232284114507/100000000000000
k[9] = 5317877966404647/10000000000000000
k[10] = 25379134149469/62500000000
k[11] = 69225021197403/250000000000
k[12] = 45937500000000000/51064984612057559
k[13] = 152274804896814/576875176645025
k[14] = 286323500516327592324816080243/442590269802782060784707094080
k[15] = 1
k[16] = 2
k[17] = 245
k[18] = 210