A046200 Odd numbers in the triangle of denominators in Leibniz's Harmonic Triangle.

1, 3, 3, 5, 5, 7, 105, 105, 7, 9, 9, 11, 495, 495, 11, 13, 6435, 6435, 13, 15, 1365, 15015, 45045, 45045, 15015, 1365, 15, 17, 17, 19, 2907, 2907, 19, 21, 101745, 101745, 21, 23, 5313, 168245, 1716099, 1716099, 168245, 5313, 23, 25, 18386775, 18386775, 25

Offset

1,2

References

L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 83, Problem 25.

Links

Table of n, a(n) for n=1..49.

Example

1/1; --> 1
1/2, 1/2; -->
1/3, 1/6, 1/3; --> 3 3
1/4, 1/12, 1/12, 1/4; --> ...
1/5, 1/20, 1/30, 1/20, 1/5; ...

Crossrefs

Cf. A003506.

Sequence in context: A142712 A247577 A282207 * A308415 A063281 A362059

Adjacent sequences: A046197 A046198 A046199 * A046201 A046202 A046203

Keyword

tabf,nonn,easy,less

Author

Mohammad K. Azarian

Extensions

More terms from James A. Sellers, Dec 13 1999

Status

approved