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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.

A049210 a(n) = -Product_{k=0..n} (8*k-1); octo-factorial numbers.

Table of values

n a(n)
0 1
1 7
2 105
3 2415
4 74865
5 2919735
6 137227545
7 7547514975
8 475493443425
9 33760034483175
10 2667042724170825
11 232032717002861775
12 22043108115271868625
13 2270440135873002468375
14 252018855081903273989625
15 29990243754746489604765375
16 3808760956852804179805202625

List of values

[1, 7, 105, 2415, 74865, 2919735, 137227545, 7547514975, 475493443425, 33760034483175, 2667042724170825, 232032717002861775, 22043108115271868625, 2270440135873002468375, 252018855081903273989625, 29990243754746489604765375, 3808760956852804179805202625]

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

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