A137754 Numerators (left to right) of Leibniz's harmonic-like triangle.
1, 1, 1, 1, 5, 1, 1, 7, 7, 1, 1, 9, 31, 9, 1, 1, 11, 49, 49, 11, 1, 1, 13, 71, 209, 71, 13, 1, 1, 15, 97, 351, 351, 97, 15, 1, 1, 17, 127, 545, 1471, 545, 127, 17, 1, 1, 19, 161, 799, 2561, 2561, 799, 161, 19, 1, 1, 21, 199, 1121, 4159, 10625, 4159, 1121, 199, 21, 1
Offset: 1
Examples
1/1; --> 1 1/2, 1/2; --> 1 1 1/3, 5/6, 1/3; --> 1 5 1 1/4, 7/12, 7/12, 1/4; --> ... 1/5, 9/20, 31/30, 9/20, 1/5;