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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.

A343259 a(n) = 2 * T(n,n/2) where T(n,x) is a Chebyshev polynomial of the first kind.

Table of values

n a(n)
0 2
1 1
2 2
3 18
4 194
5 2525
6 39202
7 710647
8 14760962
9 345946302
10 9034502498
11 260219353691
12 8195978831042
13 280256592535933
14 10340256951198914
15 409468947059131650
16 17322711762013765634
17 779742677038695037937
18 37210469265847998489922
19 1876572071974094803391179

List of values

[2, 1, 2, 18, 194, 2525, 39202, 710647, 14760962, 345946302, 9034502498, 260219353691, 8195978831042, 280256592535933, 10340256951198914, 409468947059131650, 17322711762013765634, 779742677038695037937, 37210469265847998489922, 1876572071974094803391179]

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

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