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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.

A307173 Second class of all proper positive solutions y2(n) = a(n) of the Pell equation x^2 - 7*y^2 = 9.

Table of values

n a(n)
1 1
2 20
3 319
4 5084
5 81025
6 1291316
7 20580031
8 327989180
9 5227246849
10 83307960404
11 1327700119615
12 21159893953436
13 337230603135361
14 5374529756212340
15 85655245496262079
16 1365109398183980924
17 21756095125447432705
18 346732412608974942356
19 5525962506618151644991

List of values

[1, 20, 319, 5084, 81025, 1291316, 20580031, 327989180, 5227246849, 83307960404, 1327700119615, 21159893953436, 337230603135361, 5374529756212340, 85655245496262079, 1365109398183980924, 21756095125447432705, 346732412608974942356, 5525962506618151644991]

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

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