A046204 Distinct even numbers in the triangle of denominators in Leibniz's Harmonic Triangle.

2, 6, 4, 12, 20, 30, 60, 42, 140, 8, 56, 168, 280, 72, 252, 504, 630, 10, 90, 360, 840, 1260, 110, 1320, 2310, 2772, 132, 660, 1980, 3960, 5544, 156, 858, 2860, 10296, 12012, 14, 182, 1092, 4004, 10010, 18018, 24024, 210, 5460, 30030, 51480, 16, 240

Offset

1,1

References

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

Links

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

Example

1/1; 1/2, 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; ...

Crossrefs

Cf. A003506.

Sequence in context: A134000 A127730 A118416 * A163755 A100851 A351500

Adjacent sequences: A046201 A046202 A046203 * A046205 A046206 A046207

Keyword

tabf,nonn,easy

Author

Mohammad K. Azarian

Extensions

More terms from James A. Sellers, Dec 13 1999

Status

approved