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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.

A202827 Expansion of e.g.f.: exp(4*x/(1-x)) / sqrt(1-x^2).

Table of values

n a(n)
0 1
1 4
2 25
3 196
4 1849
5 20164
6 249001
7 3422500
8 51739249
9 851822596
10 15155825881
11 289527934084
12 5906625426025
13 128089110981316
14 2940882813228649
15 71239270847432164
16 1815115761586307041
17 48511703775281296900
18 1356708799439194070809
19 39615996090901693902916

List of values

[1, 4, 25, 196, 1849, 20164, 249001, 3422500, 51739249, 851822596, 15155825881, 289527934084, 5906625426025, 128089110981316, 2940882813228649, 71239270847432164, 1815115761586307041, 48511703775281296900, 1356708799439194070809, 39615996090901693902916]

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

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