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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.

A373644 a(n) = Sum_{k=0..floor(n/4)} binomial(2*n-7*k,k).

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 2
5 4
6 6
7 8
8 11
9 18
10 29
11 44
12 64
13 96
14 148
15 228
16 345
17 519
18 786
19 1198
20 1824
21 2766
22 4190
23 6358
24 9661
25 14674
26 22268
27 33786
28 51284
29 77866
30 118212
31 179426
32 272333
33 413391
34 627547
35 952613
36 1445995
37 2194911
38 3331793
39 5057593
40 7677250
41 11653681
42 17689720

List of values

[1, 1, 1, 1, 2, 4, 6, 8, 11, 18, 29, 44, 64, 96, 148, 228, 345, 519, 786, 1198, 1824, 2766, 4190, 6358, 9661, 14674, 22268, 33786, 51284, 77866, 118212, 179426, 272333, 413391, 627547, 952613, 1445995, 2194911, 3331793, 5057593, 7677250, 11653681, 17689720]

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

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