A046208 In Leibniz's Harmonic Triangle, write the numerator first and then the denominator of each element to the right of the central elements.

1, 2, 1, 3, 1, 12, 1, 4, 1, 20, 1, 5, 1, 60, 1, 30, 1, 6, 1, 105, 1, 42, 1, 7, 1, 280, 1, 168, 1, 56, 1, 8, 1, 504, 1, 252, 1, 72, 1, 9, 1, 1260, 1, 840, 1, 360, 1, 90, 1, 10, 1, 2310, 1, 1320, 1, 495, 1, 110, 1, 11, 1, 5544, 1, 3960, 1, 1980, 1, 660, 1, 132, 1, 12, 1, 10296, 1

Offset

1,2

References

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

Links

Table of n, a(n) for n=1..75.

Crossrefs

Cf. A003506.

Sequence in context: A337276 A098570 A122048 * A195909 A195697 A137764

Adjacent sequences: A046205 A046206 A046207 * A046209 A046210 A046211

Keyword

tabf,nonn,easy

Author

Mohammad K. Azarian

Extensions

More terms from James A. Sellers, Dec 13 1999

Status

approved