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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A209430 Denominator of l(n), where l(1)=1, l(2)=2, l(n)=l(n-1)+2*l(n-2)/n.

Table of values

n a(n)
1 1
2 1
3 3
4 3
5 15
6 45
7 315
8 315
9 2835
10 14175
11 155925
12 467775
13 6081075
14 42567525
15 58046625
16 638512875
17 10854718875
18 97692469875
19 1856156927625
20 9280784638125
21 194896477400625
22 2143861251406875
23 49308808782358125
24 147926426347074375
25 217538862275109375
26 4370553505709015625

List of values

[1, 1, 3, 3, 15, 45, 315, 315, 2835, 14175, 155925, 467775, 6081075, 42567525, 58046625, 638512875, 10854718875, 97692469875, 1856156927625, 9280784638125, 194896477400625, 2143861251406875, 49308808782358125, 147926426347074375, 217538862275109375, 4370553505709015625]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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