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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.

A084221 a(n+2) = 4*a(n), with a(0)=1, a(1)=3.

Table of values

n a(n)
0 1
1 3
2 4
3 12
4 16
5 48
6 64
7 192
8 256
9 768
10 1024
11 3072
12 4096
13 12288
14 16384
15 49152
16 65536
17 196608
18 262144
19 786432
20 1048576
21 3145728
22 4194304
23 12582912
24 16777216
25 50331648
26 67108864
27 201326592
28 268435456
29 805306368
30 1073741824
31 3221225472
32 4294967296
33 12884901888

List of values

[1, 3, 4, 12, 16, 48, 64, 192, 256, 768, 1024, 3072, 4096, 12288, 16384, 49152, 65536, 196608, 262144, 786432, 1048576, 3145728, 4194304, 12582912, 16777216, 50331648, 67108864, 201326592, 268435456, 805306368, 1073741824, 3221225472, 4294967296, 12884901888]

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

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