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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.

A349073 a(n) = U(2*n, n), where U(n, x) is the Chebyshev polynomial of the second kind.

Table of values

n a(n)
0 1
1 3
2 209
3 40391
4 15003009
5 9127651499
6 8254109243953
7 10393834843080975
8 17391182043967249409
9 37326390852372133364819
10 99976027392046047055178001
11 326887883645157139828711692503
12 1281398359905415379814555044995201
13 5932135472283024519893762690145006075

List of values

[1, 3, 209, 40391, 15003009, 9127651499, 8254109243953, 10393834843080975, 17391182043967249409, 37326390852372133364819, 99976027392046047055178001, 326887883645157139828711692503, 1281398359905415379814555044995201, 5932135472283024519893762690145006075]

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

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