cp's OEIS Frontend

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.

A119921 Number of rationals in [0, 1) having at most n preperiodic bits, then at most n periodic bits.

Table of values

n a(n)
1 2
2 12
3 72
4 336
5 1632
6 6720
7 29568
8 120576
9 499200
10 2012160
11 8214528
12 32894976
13 132882432
14 532070400
15 2136637440
16 8551464960
17 34282536960
18 137135652864
19 549148164096
20 2196721631232
21 8791208755200
22 35166005231616

List of values

[2, 12, 72, 336, 1632, 6720, 29568, 120576, 499200, 2012160, 8214528, 32894976, 132882432, 532070400, 2136637440, 8551464960, 34282536960, 137135652864, 549148164096, 2196721631232, 8791208755200, 35166005231616]

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

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