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

Author

Mohammad K. Azarian

Keywords

• tabf
• nonn
• easy

References

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

Crossrefs

Cf. A003506.

Extensions

More terms from James Sellers, Dec 13 1999