cp's OEIS Frontend

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.

A005252 a(n) = Sum_{k=0..floor(n/4)} binomial(n-2k,2k).

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 2
5 4
6 7
7 11
8 17
9 27
10 44
11 72
12 117
13 189
14 305
15 493
16 798
17 1292
18 2091
19 3383
20 5473
21 8855
22 14328
23 23184
24 37513
25 60697
26 98209
27 158905
28 257114
29 416020
30 673135
31 1089155
32 1762289
33 2851443
34 4613732
35 7465176
36 12078909
37 19544085
38 31622993

List of values

[1, 1, 1, 1, 2, 4, 7, 11, 17, 27, 44, 72, 117, 189, 305, 493, 798, 1292, 2091, 3383, 5473, 8855, 14328, 23184, 37513, 60697, 98209, 158905, 257114, 416020, 673135, 1089155, 1762289, 2851443, 4613732, 7465176, 12078909, 19544085, 31622993]