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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.

A098577 a(n) = Sum_{k=0..floor(n/5)} C(n-3*k,2*k) * 2^k.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 1
5 3
6 7
7 13
8 21
9 31
10 47
11 77
12 133
13 231
14 391
15 645
16 1053
17 1727
18 2863
19 4781
20 7989
21 13303
22 22071
23 36565
24 60621
25 100655
26 167295
27 278077
28 461989
29 767143
30 1273607
31 2114661
32 3511869
33 5833055
34 9688527
35 16091213
36 26723221
37 44378967
38 73700823

List of values

[1, 1, 1, 1, 1, 3, 7, 13, 21, 31, 47, 77, 133, 231, 391, 645, 1053, 1727, 2863, 4781, 7989, 13303, 22071, 36565, 60621, 100655, 167295, 278077, 461989, 767143, 1273607, 2114661, 3511869, 5833055, 9688527, 16091213, 26723221, 44378967, 73700823]

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

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