A046201 Distinct odd numbers in the triangle of denominators in Leibniz's Harmonic Triangle.
1, 3, 5, 7, 105, 9, 11, 495, 13, 6435, 15, 1365, 15015, 45045, 17, 19, 2907, 21, 101745, 23, 5313, 168245, 1716099, 25, 18386775, 27, 8775, 42181425, 143416845, 29, 593775, 90135045, 882230895, 31, 13485, 849555, 18407025, 181440675
Offset: 1
Examples
1/1; 1/2, 1/2; 1/3, 1/6, 1/3; 1/4, 1/12, 1/12, 1/4; 1/5, 1/20, 1/30, 1/20, 1/5; ...
References
- L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 83, Problem 25.
Extensions
More terms from James Sellers, Dec 13 1999