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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.

A387629 a(n) = Sum_{k=0..floor(n/4)} 2^k * binomial(2*n-6*k+1,2*k+1).

Table of values

n a(n)
0 1
1 3
2 5
3 7
4 11
5 31
6 83
7 183
8 351
9 675
10 1435
11 3231
12 7119
13 14987
14 30963
15 64871
16 138775
17 298403
18 636091
19 1344191
20 2838399
21 6021371
22 12818467
23 27277207
24 57911207
25 122790675
26 260485131
27 553185519
28 1175285967
29 2496108459
30 5298760307
31 11246985927
32 23877452663
33 50702334403

List of values

[1, 3, 5, 7, 11, 31, 83, 183, 351, 675, 1435, 3231, 7119, 14987, 30963, 64871, 138775, 298403, 636091, 1344191, 2838399, 6021371, 12818467, 27277207, 57911207, 122790675, 260485131, 553185519, 1175285967, 2496108459, 5298760307, 11246985927, 23877452663, 50702334403]

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

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