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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.

A349072 a(n) = T(n, 3*n), where T(n, x) is the Chebyshev polynomial of the first kind.

Table of values

n a(n)
0 1
1 3
2 71
3 2889
4 164737
5 12082575
6 1083358151
7 114812765781
8 14040770918401
9 1946133989077851
10 301491888156044999
11 51624542295308885793
12 9681761035138427706241
13 1973656779656041723763559
14 434528364117341972641648967
15 102755067271708508826774929325

List of values

[1, 3, 71, 2889, 164737, 12082575, 1083358151, 114812765781, 14040770918401, 1946133989077851, 301491888156044999, 51624542295308885793, 9681761035138427706241, 1973656779656041723763559, 434528364117341972641648967, 102755067271708508826774929325]

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

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