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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.

A271945 Expansion of 4*x^2/(1 - x - 9*x^2 + x^3).

Table of values

n a(n)
0 0
1 0
2 4
3 4
4 40
5 72
6 428
7 1036
8 4816
9 13712
10 56020
11 174612
12 665080
13 2180568
14 7991676
15 26951708
16 96696224
17 331269920
18 1174584228
19 4059317284
20 14299305416
21 49658576744
22 174293008204
23 606920893484
24 2125899390576
25 7413894423728
26 25940068045428
27 90539218468404

List of values

[0, 0, 4, 4, 40, 72, 428, 1036, 4816, 13712, 56020, 174612, 665080, 2180568, 7991676, 26951708, 96696224, 331269920, 1174584228, 4059317284, 14299305416, 49658576744, 174293008204, 606920893484, 2125899390576, 7413894423728, 25940068045428, 90539218468404]

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

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