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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.

A387484 a(n) = Sum_{k=0..floor(n/3)} 2^(n-k) * binomial(k,n-3*k)^2.

Table of values

n a(n)
0 1
1 0
2 0
3 4
4 8
5 0
6 16
7 128
8 64
9 64
10 1152
11 2304
12 768
13 8192
14 36864
15 33792
16 55296
17 409600
18 823296
19 704512
20 3719168
21 13123584
22 16351232
23 33619968
24 160890880
25 329515008
26 436731904
27 1695809536
28 5182586880
29 7935623168
30 18086887424
31 67335356416
32 141687783424

List of values

[1, 0, 0, 4, 8, 0, 16, 128, 64, 64, 1152, 2304, 768, 8192, 36864, 33792, 55296, 409600, 823296, 704512, 3719168, 13123584, 16351232, 33619968, 160890880, 329515008, 436731904, 1695809536, 5182586880, 7935623168, 18086887424, 67335356416, 141687783424]

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

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