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.

A185021 a(n) = h(1)*h(2)*...*h(n), where h(i) = i/[g(i/2)*g(i/4)*g(i/8)*...] and g(x) = x if x is an integer and g(x) = 1 otherwise.

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 12
5 60
6 120
7 840
8 840
9 7560
10 15120
11 166320
12 110880
13 1441440
14 2882880
15 43243200
16 10810800
17 183783600
18 367567200
19 6983776800
20 2793510720
21 58663725120
22 117327450240
23 2698531355520
24 299836817280
25 7495920432000
26 14991840864000
27 404779703328000
28 115651343808000
29 3353888970432000
30 6707777940864000

List of values

[1, 1, 2, 6, 12, 60, 120, 840, 840, 7560, 15120, 166320, 110880, 1441440, 2882880, 43243200, 10810800, 183783600, 367567200, 6983776800, 2793510720, 58663725120, 117327450240, 2698531355520, 299836817280, 7495920432000, 14991840864000, 404779703328000, 115651343808000, 3353888970432000, 6707777940864000]

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

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