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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.

A180343 a(0)=-4; a(n+1) = 2*a(n) + period 4: repeat 6,1,2,5.

Table of values

n a(n)
0 -4
1 -2
2 -3
3 -4
4 -3
5 0
6 1
7 4
8 13
9 32
10 65
11 132
12 269
13 544
14 1089
15 2180
16 4365
17 8736
18 17473
19 34948
20 69901
21 139808
22 279617
23 559236
24 1118477
25 2236960
26 4473921
27 8947844
28 17895693
29 35791392
30 71582785
31 143165572
32 286331149
33 572662304
34 1145324609
35 2290649220
36 4581298445

List of values

[-4, -2, -3, -4, -3, 0, 1, 4, 13, 32, 65, 132, 269, 544, 1089, 2180, 4365, 8736, 17473, 34948, 69901, 139808, 279617, 559236, 1118477, 2236960, 4473921, 8947844, 17895693, 35791392, 71582785, 143165572, 286331149, 572662304, 1145324609, 2290649220, 4581298445]

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