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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.

A135863 G.f. A(x) = 1 + 4*x*A(x)^(1/2); A(x) = 1 + 8*x^2 + 4*x*sqrt(1 + 4*x^2).

Table of values

n a(n)
0 1
1 4
2 8
3 8
4 0
5 -8
6 0
7 16
8 0
9 -40
10 0
11 112
12 0
13 -336
14 0
15 1056
16 0
17 -3432
18 0
19 11440
20 0
21 -38896
22 0
23 134368
24 0
25 -470288
26 0
27 1664096
28 0
29 -5943200
30 0
31 21395520
32 0
33 -77558760
34 0
35 282861360
36 0
37 -1037158320
38 0
39 3821109600
40 0
41 -14138105520
42 0
43 52512963360
44 0
45 -195730136160

List of values

[1, 4, 8, 8, 0, -8, 0, 16, 0, -40, 0, 112, 0, -336, 0, 1056, 0, -3432, 0, 11440, 0, -38896, 0, 134368, 0, -470288, 0, 1664096, 0, -5943200, 0, 21395520, 0, -77558760, 0, 282861360, 0, -1037158320, 0, 3821109600, 0, -14138105520, 0, 52512963360, 0, -195730136160]

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

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