cp's OEIS Frontend

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.

A052923 Expansion of (1-x)/(1 - x - 4*x^2).

Table of values

n a(n)
0 1
1 0
2 4
3 4
4 20
5 36
6 116
7 260
8 724
9 1764
10 4660
11 11716
12 30356
13 77220
14 198644
15 507524
16 1302100
17 3332196
18 8540596
19 21869380
20 56031764
21 143509284
22 367636340
23 941673476
24 2412218836
25 6178912740
26 15827788084
27 40543439044
28 103854591380

List of values

[1, 0, 4, 4, 20, 36, 116, 260, 724, 1764, 4660, 11716, 30356, 77220, 198644, 507524, 1302100, 3332196, 8540596, 21869380, 56031764, 143509284, 367636340, 941673476, 2412218836, 6178912740, 15827788084, 40543439044, 103854591380]

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

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