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.

A355990 a(n) = n! / (6 * floor(n/3)!).

Table of values

n a(n)
3 1
4 4
5 20
6 60
7 420
8 3360
9 10080
10 100800
11 1108800
12 3326400
13 43243200
14 605404800
15 1816214400
16 29059430400
17 494010316800
18 1482030950400
19 28158588057600
20 563171761152000
21 1689515283456000
22 37169336236032000
23 854894733428736000
24 2564684200286208000

List of values

[1, 4, 20, 60, 420, 3360, 10080, 100800, 1108800, 3326400, 43243200, 605404800, 1816214400, 29059430400, 494010316800, 1482030950400, 28158588057600, 563171761152000, 1689515283456000, 37169336236032000, 854894733428736000, 2564684200286208000]

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

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