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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.

A329498 Denominator of the rational number alpha_n involved in the calculation of the second moment of the n-th term of Ulam's "history-dependent random sequence".

Table of values

n a(n)
1 1
2 1
3 2
4 6
5 24
6 120
7 720
8 1680
9 40320
10 362880
11 725760
12 7983360
13 2128896
14 113218560
15 387459072
16 261534873600
17 836911595520
18 71137485619200
19 75322043596800
20 1621934672117760
21 37429261664256000
22 10218188434341888000
23 224800145555521536000

List of values

[1, 1, 2, 6, 24, 120, 720, 1680, 40320, 362880, 725760, 7983360, 2128896, 113218560, 387459072, 261534873600, 836911595520, 71137485619200, 75322043596800, 1621934672117760, 37429261664256000, 10218188434341888000, 224800145555521536000]

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

Content is available under The OEIS End-User License Agreement.