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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.

A174427 a(n) = floor(d(n)/18^(n-1)) where d(n) = 0, 1, -8, 352, -5120,.. and d(n) = -8*d(n-1) +288*d(n-2).

Table of values

n a(n)
0 0
1 1
2 -1
3 1
4 -1
5 1
6 -2
7 1
8 -3
9 2
10 -3
11 3
12 -5
13 5
14 -6
15 7
16 -9
17 10
18 -12
19 14
20 -17
21 20
22 -25
23 28
24 -35
25 40
26 -49
27 57
28 -69
29 81
30 -98
31 116
32 -139
33 164
34 -196
35 233
36 -278
37 330
38 -395
39 469
40 -559
41 665
42 -793
43 943
44 -1125
45 1338
46 -1595
47 1898
48 -2261
49 2692
50 -3206

List of values

[0, 1, -1, 1, -1, 1, -2, 1, -3, 2, -3, 3, -5, 5, -6, 7, -9, 10, -12, 14, -17, 20, -25, 28, -35, 40, -49, 57, -69, 81, -98, 116, -139, 164, -196, 233, -278, 330, -395, 469, -559, 665, -793, 943, -1125, 1338, -1595, 1898, -2261, 2692, -3206]

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

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