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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.

A121826 a(n) = Product_{k=1..n} D(k), where D() are the doublets, A020338.

Table of values

n a(n)
1 11
2 242
3 7986
4 351384
5 19326120
6 1275523920
7 98215341840
8 8642950081920
9 855652058110080
10 864208578691180800
11 960135730925901868800
12 1163684505882193064985600
13 1527917756223319494326092800
14 2160475707299773764977095219200
15 3273120696559157253940299257088000

List of values

[11, 242, 7986, 351384, 19326120, 1275523920, 98215341840, 8642950081920, 855652058110080, 864208578691180800, 960135730925901868800, 1163684505882193064985600, 1527917756223319494326092800, 2160475707299773764977095219200, 3273120696559157253940299257088000]

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

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